“The food was great as always Gojo!” Marin beamed, handing him a stack of plates.

“Glad to hear it, Kitagawa,” Gojo said, returning the smile. Gojo and Marin were officially a couple. They were now in college and had moved together into an apartment. Marin was still doing modeling on the side for income while studying for a business degree, while Gojo still worked at his family’s doll shop while taking a couple of classes in photography. Their main income however came from their Patreon, where Marin cosplayed and Gojo showed off the creation and techniques going into the costumes.

“So I was doing the math last night, it looks like we can afford to do another big cosplay,” Gojo said over his shoulder while washing dishes.

“Really?! That’s great!” Marin shouted. “It’s just the right time too since there’s a convention I wanted to go to!” She said, pulling up some info on her phone.

Gojo walked back into the main room, took the phone she was offering, and started to read the post he was looking at. His smile was quickly replaced with an expression of muted disbelief and a lack of surprise. What Gojo was looking at was an information post about a hentai convention, based around hentai, doujinshi, and other adult media. It was so adult that you needed to be twenty-one to enter the venue as indecent exposure would be allowed. Gojo sighed, knowing full well that Marin wouldn’t be talked out of going. “Do you have a cosplay in mind?” Gojo asked, almost afraid to do so.

“You know it! It’s from one of my favorite hentai videos!” Marin said, taking the phone back for a second. After scrolling through a couple of photos she handed her phone back to Gojo.

When Gojo saw the character, his jaw dropped in shock. The character in question, her name being Heartthrob, was one that could only exist in hentai. She was practically an Amazon, standing at nearly seven feet tall in sparkly heels, breasts even bigger than her head, an ass that could smother two people at once,  a set of both male and female genitalia, and all while dressed up like a magical girl with above average muscles. Gojo struggled to find the words he was looking for, ultimately settling on “Is this really a good idea?” He said spastically.

Marin gave him a little pout, “You don’t think I could pull her off?”

“N-no! That’s not what I mean!” Gojo said, not wanting to insult his girlfriend. “What I meant is that this is pretty revealing. Her privates are on full display, plus there’s no way to make it all look natural.”

“What do you mean by natural?” Marin asked, sliding closer to Gojo.

“Well, normally we would use the silicone breastplate and pads to fill out the curves, but since Heartthrob wears so little clothing we can’t hide the cut-offs. There’s also the issue of the other equipment,” Gojo said, pointing to Heartthrob’s set of male genitals. “I don’t even know how we’re gonna do that.”

“Well, let’s do inventory first. I know we have the breastplate we need, remember when we accidentally got one nearly two times bigger than what we needed?” Marin asked. Gojo did remember, it was for a Lady Dimitrescu cosplay that they were doing. “It should be about the right size, plus we can use skin-colored tights to hide the pads and the straps for the codpiece. We can just cut a hole so I can still show off the goods.” Marin said with a chuckle.

Gojo sighed, knowing it was a losing battle to try and convince her not to cosplay her. “Are you gonna be okay showing off this much? You’re gonna be on full display.” He asked.

“I am… but only if you are,” Marin said, wrapping herself around Gojo’s arm. “I don’t wanna make my boyfriend upset.”

Gojo gave her a soft smile. “I just wanna make sure you’ll be okay. It’s settled then, I’ll get to work watching the source material tonight.“ Gojo said, pulling out his reference-making material.

“Oh hold on, I got the DVD for all three episodes! We can watch it here in the main room while you work and I look up props and stuff!” Marin said while running off. After retrieving and putting in the DVD, the duo got to work.

Gojo watched with intensity as a story unfolded about a regular college student who would magically turn into Heartthrob and defeat evil monster girls… by fucking them and getting fucked. Every episode started the same, Heartthrob’s alter ego would complain about how her magical duties kept her from her friends and finding a partner, a monster would attack, they would fuck, and the episode would end.

Gojo was focused on every scene with Heartthrob in it, which always came after a lengthy, sexual transformation sequence. Heartthrob would use a phallic-shaped wand to increase her assets before sticking it above her vagina where it would turn into her cock. She was nearly seven feet tall with her heels on, she had curly blue hair that only reached her shoulders, her bust was a Japanese N cup, and with an ass that was off the charts. The other wild thing was her dick, it was a foot long and nearly four inches in diameter and her balls were so big and hung so low it almost obscured her vagina. As Gojo made his initial sketches, he began to grow flustered and felt himself getting harder as he drew her details. Usually, he wasn’t into this type of stuff, but this time around he actually found it kind of hot.

On the other side of the couch, Marin was searching the web for any props and materials that they would need when she found the perfect prop. It was a one-to-one scale replica of Heartthrob’s transformation wand and it was dirt cheap! She didn’t hesitate to hit order on it, before setting her phone down to watch the tv. She tuned in just in time to watch Heartthrob get railed by a Lamia. Marin watched with interest as she grew flustered as well, she peaked over at Gojo who was trying his best to focus but the bulge in his pants told a different story.

Gojo had just finished sketching all the hearts that made up Heartthrob’s outfit when the video was suddenly paused. “I-is something wrong Mar-“ Gojo began to ask, turning to find Marin right next to him. He could see that her collar was loose and her hand was buried between her thighs. “Do you wanna-“

“God yes, let’s go,” Marin said, dragging him towards their bedroom.

______________________________________

After a couple of days of shopping and prep work, the costume was finally assembled. The wig was prepped, the outfit was sown together, and all the fake body parts were sitting in a pile near the door. Gojo sat down, wiping the sweat from his brow, he didn’t like to finish the costume on the day of the convention but it couldn’t be helped this time around. He was just about to get Marin to test it when she burst through the door to the workroom. “It’s here! It’s finally here!” She shouted, pulling a box knife off of Gojo’s work table to open the box.

“Oh, did Heartthrob’s wand finally show up?” Gojo asked, getting up to take a look at the prop. The two were expecting a decently made prop for what Marin had paid for it, only to find a masterfully crafted wand that seemed to be made out of the finest material. “Wow! I didn’t know it would look this good!” He exclaimed.

“I know right!? It doesn’t look anything like the pictures so maybe we got lucky!” Marin added on, taking the wand in her hand. She felt giddy holding the wand, not noticing Gojo walk back over to the costume.

She planted her feet on the ground and began to swing the wand, too focused on her choreography to notice it glowing. “To protect the people I love!” she said, tapping herself on the head with the wand. Marin slowly started to rise upwards, her legs getting smoother and fuller as her thighs rounded out.

“To prove that I can be loved!” She shouted, bringing the wand down to her ass. Her ass began to swell in size, swallowing her panties and the fabric of the pants she was wearing in between her growing cheeks. Her hips pushed outwards to match her ass and thighs in size, causing the button on her pants to come undone.

“I am Heartthrob, Warrior of Love!” She said, bringing the wand to her chest. Her already ample chest began to swell and grow, slowly swallowing up her hands and the wand. While her chest kept growing, Marin’s muscles bulked up all around her body giving her a chiseled look to add to her sexiness. Marin pulled her arms away from her now N-cup breasts, swiping the wand downward through the air.

“I’m here to Lay and Slay you!” Marin said with all her heart, plunging the wand down onto her crotch right where her button had come undone. The wand suddenly attached itself to Marin’s crotch, the glass turning to flesh while growing larger. The two crystal orbs near the base of the wand began to hang and swell alongside the wand. The wand kept growing longer and wider, quickly matching Heartthob’s depiction. The wand gave off one final glow before the tip merged with Marin’s new cock, completing her transformation.

Marin blinked as the blinding flash died down, she looked down at her changed body with awe. “Wow Gojo, how’d you get all the prosthetics on me while I was doing the transformation scene?” She asked, turning to Gojo. Gojo gawked in horror as he held the breastplate and hip pads in his hands, unable to process what happened. “Wait, if those are the prosthetics, what is…” Marin began to say, looking down at the foot-long rod on her body which suddenly twitched.

The couple screamed in horror as Marin had taken on the body proportions of Heartthrob. “Gojo! What do I do? It’s twitching and all hard!” Marin shouted, her hands wrapped around her cock.

“I-I don’t know!! Where’s the box the prop came in?! Maybe it has instructions?!?” He shouted, furiously looking for the box. When he finally found it, he ripped it apart looking for anything that would help them but ultimately found nothing. “Okay, nothing there. Do you have any ideas?” He asked.

“Well, if this thing was activated by the transformation chant… maybe if I do things that Heartthrob would do, it’ll change me back to normal?” Marin suggested.

“That’s a good point… but doesn’t Heartthrob need to destroy a monster to turn back?”

“No actually, she has three shots to try and take down the monster. After the third shot, she goes back to normal. So I just need to cum three times!” Marin said, starting to get excited.

“That is if that thing works,” Gojo said, looking at the foot-long mast.

“Well, we’re out of options so here goes,” Marin said, starting to move her hand up and down the shaft. Marin was surprised to find that the new member was super sensitive, every touch sending a new sensation down her spine. It didn’t take long before Marin made her first shot, her “purifying seed” landing all over the mats in the workroom. “Oh… I’m sorry Gojo.” She said sheepishly.

“It’s okay. We’ve done worse in this room.” Gojo said, cleaning up the mess. “Well, two more shots and we’ll be golden!”

“About that… remember how Heartthrob would always cum due to different forms of stimulation? That’s because she can’t cum the same way more than once during a transformation, so handjobs are out.” Marin explained.

“Oh crap, what’re we gonna do then?” Gojo asked, starting to spiral with worry.

“I might have something that can help…” Marin said sheepishly. She started walking towards their shared bedroom, ducking under the door frames thanks to her new height before approaching her memorabilia closet. She began to pull at something tucked in the corner until it came crashing out. Marin had pulled out a life-sized doll of Shizuku-tan.

Gojo thought it was just a normal doll until he got closer and saw the holes, it was a sex doll of Shizuku-tan. His shocked but not surprised expression returned as he turned towards his girlfriend. “How long have you had this?”

“Since before we moved in, I snuck it in when you were at work one day…” Marin said, picking up the doll and laying it on the bed. “Besides, I thought it was just a regular doll until it arrived, and it was too late to ship it back.” She reached down into a drawer near the bed and pulled out a tube of lube. Marin began to lube herself and the doll before she inserted herself into one of the doll’s holes. “Damn, it’s so tight! It probably wasn’t meant for something this big!” Marin groaned as she grinded up against the doll. She began to moan as she thrust over and over again into the doll.

On the other side of the room, Gojo was torn on what to do. He just stood off to the side watching his girlfriend fuck a sex doll, all with a raging hard-on in his pants. He didn’t even realize he was starting to touch himself until his hand made contact with his cock. He looked down at himself before looking back at his girlfriend, who was still thrusting into the doll. He put all his reservations to the side and began to masturbate alongside his girlfriend.

The two began to make noises in sync as they both reached a climax, Gojo releasing all over the floor while Marin came into the doll. The two caught their breath as Marin pulled out of the doll and flipped it over, finally realizing that Gojo was also acting on his impulses. “D-did you find that sexy?” Marin asked, a little embarrassed. Gojo only nodded as he began to clean up his mess. “Alright, let’s finish this Shizuku-tan!” She shouted, flipping the doll over and plunging her still lubed cock into its asshole.

Marin began to thrust in and out of the doll’s ass when she noticed it didn’t feel as good as the first time. It dawned on her that the doll wasn’t going to work again since she had already came with a sex toy. “Oh no! Gojo! This is bad! The doll isn’t working anymore!” Marin said, pulling out and starting to panic. “I’ve got nothing else to work with! What are we-“ she started to shout before turning to Gojo, who was on his hands and knees. It reminded her of something they tried a while back. “Hey Gojo… do you remember that thing we did back on my birthday?”

“Of course I remember, I couldn’t walk or sit down for two days. I had to call off…” Gojo replied before the realization dawned on him. “No! No! We said it was a one-time thing!” He began to shout.

“Oh really? I remember someone saying they enjoyed it more than they thought they would, and that they’d maybe be willing to try it again sometime.” Marin said, a grin forming on her face. “And you wouldn’t want to leave your girlfriend stuck like this… unless you have any other ideas?” She asked.

Gojo went silent as he began weighing his options. He went pale as he realized that this was his best option. “Okay, we’ll do it. However, we should make sure that the outfit fits you like that before you change back.”

“Oh, that’s a good idea Gojo!” Marin said, running back to the work room. Gojo sighed, knowing he only bought himself a little time.

______________________________________

“Thanks for coming to see me!” Marin shouted, waving to the guest that just left. Three days had passed since the “event” in their apartment and the couple was now at the hentai convention. Marin was all dolled up in her Heartthrob cosplay, her curly blue hair bouncing with every move she made, her nipples were on full display in the center of little hearts, her poofy skirt hung off her hips while having windows in the front and back to show off the goods. There were three more hearts on Marin’s outfit, one that her cock with going through, one right below that showed off her pussy, and one around the back that showed off her asshole.

“Thanks for your purchase!” Gojo said, handing the shopper a bag full of Marin’s prints. He slowly eased himself down onto the seat he had at their booth, letting out a groan of slight discomfort. “Well, we’ll definitely have enough to splurge on the next cosplay. I’m just glad we can finally go home.” He said, looking at Marin.

“I know right! Maybe we’ll find something fun like the wand again!” She said with excitement, the polar opposite of Gojo’s look of fear.

“I can’t believe what I’m seeing,” a sharp voice called out. Gojo and Marin turned to see Sajuna Inui standing at their booth, dumbfounded at Marin’s outfit. “Do you not have any shame? Showing yourself off like that, even if some pieces are fake?”

“Sajuna! I can’t believe you came to a hentai convention!” Marin said, rushing over to Sajuna. What Marin didn’t account for was that due to her new height, Sajuna was at eye level with her crotch and was nearly slapped by Marin’s cock.

“Get that fake thing away from me!” Sajuna said, pushing it away from her face. Her eyes went wide as her hand felt the flesh rod twitch at her touch. “W-wait, there’s no way that thing is real! It’s not possible!!” Sajuna said, starting to freak out.

“Oh, yeah it is! I bought a cosplay prop online and it gave me the proportions of Heartthrob!” Marin said, as if growing a magical footling cock was a normal everyday event.

Sajuna turned towards Gojo, “Please tell me she’s just making a joke.” Her only response was a sullen head shake. “No! I refuse to believe it!” Sajuna said, crossing her arms.

“Whatever, believe what you wanna believe,” Marin said, taking off her wig. “Anyway, I gotta change back…” Marin began to say before a devilish smile crossed her face. “Hey Sajuna, wanna try it out? If you don’t think it’s real, then it shouldn’t be a problem for you. Plus, I believe you owe me a favor for that last-minute cosplay help last month.” Marin teased, wrapping her arm around Sajuna.

“I-I mean, of course, it’s fake. I’ll show you!” Sajuna shouted, dragging Marin into a privacy booth.

As Sajuna dragged Marin off, Gojo let out a sigh of relief. “Oh god, I don’t think I could’ve taken another pegging session so soon.”