Tight Spy

a

TransFun Serum story

by

clancy688

The soughing sound of water Daniel heard through the closed bathroom door while he tiptoed towards his older sister's room had a calming influence on his mind. It meant that Jennifer would be occupied for at least another ten minutes until she'd leave the bath for her own room, even if she'd step out of the shower now. Normally, her lengthy bathroom sessions tended to infuriate him, but today he was actually glad for this quirk of Jennifer's. Because this meant that she wouldn't catch him sneaking into her room.

Even under normal circumstances, Jennifer absolutely hated it when he put a foot into her room. How she'd react when she saw him right now, naked like he'd been put into this world, didn't bear thinking upon. And if his parents would catch him, their reaction would probably even be worse. Thankfully, they were away on a wedding for the weekend, so no danger from that side either. Now the obvious reason for why a brother should sneak butt-naked into his teenaged sister's lair was certainly that he was a pervert, harboring sentiments for his sibling. 

In Daniel's case, this was ridiculous, of course. If all, she was a bit too much on the chubby side for him to find her attractive. And brunette's really didn't turn him on. He rather liked blonde's. No, the reason was something entirely different. He'd just set out on a top-secret spying mission for his father. A mission so secret, that even his 'employer' didn't know anything about it. Which was a good thing, because his father would probably beat the living daylights out of him if he'd ever get a whiff of his mission plan. But that was fine for Daniel. He'd read enough spy novels to know that plausible deniability was an essential component in the intelligence business. The higher-ups always wanted to have the knowledge, but without knowing how the information had been acquired, and without having to take responsibility for the missions which went straight into the crapper. 

Which was exactly the situation at home. Now that Jennifer had turned eighteen, she was spending less time at home with each passing month. Sometimes, she'd even be gone over the night. Since she was legally an adult that was her right to do so, and their parents were liberal enough to not put any chains on her. It still drove their father crazy, though, especially the fact that while everyone suspected that she had a boyfriend, she hadn't lost a single word about a possible love interest, neither denying nor confirming the claim. Whenever Dad asked, she simply smiled at him with the expression of a mother who was tired of her five-year-old's antics. And when he inquired where she was going to tonight, it was always to "meet with friends". 

This was one of the few cases where Daniel could actually relate to his sister's thinking. If she'd tell her father about her boyfriend, including his identity, he'd probably submit the poor fellow to a rigorous interrogation which would put everything they did at Guantanamo Bay to shame. Purely for her own good. All to make sure that his darling daughter wasn't dating a windbag, of course. It was understandable that Jennifer wanted to spare her boyfriend this ordeal. If she had a boyfriend of course. And that was exactly what he'd planned to find out tonight. 

There was a reward waiting, after all. His father had stated in more or less cryptic hints that he'd welcome any revelations about Jennifer's relationship status. And of course whoever brought him the information would be rewarded for his or her troubles. Daniel had just turned sixteen, and he could use a few extra bucks to acquire the used Camaro sitting in Tom's Second Hand Cars' exhibition, just waiting for a young, promising driver like him. 

The only problem was that his sister wasn't sharing such personal information even with him, her brother. She probably knows that my loyalty is to the highest bidder... Daniel reflected ruefully. But well, so be it. This was merely a minor hindrance, barely a stepping stone, and he'd just devised the ultimate plan to acquire the intel himself.

Attentively, Daniel looked at the tiny vial in his hands now. He'd only found out about InaniMates' products by chance, but then these new vials offered limitless possibilities. He'd considered using a TransFun vial to turn into a bird and follow Jennifer's car, but he hadn't been sure what he'd do when she entered a building. If he'd be right on her body, on the other hand, unbeknownst to her, that would be a different matter. And this was the point where InaniMates entered the equation.   

Daniel licked his lips, a sly smile curling around his lips as he took in the appearance of his sister's room. It was pure and utter antithesis to Jennifer's normal, neat and tidy outwards appearance. The girl was always groomed perfectly, here room on the other hand... not so much. It looked as if a bomb had went off inside. There was clothing and stuff splattered all over the floor, and that was exactly what he'd counted on. If he'd use an InaniMates vial to become her clothing, he'd need to become something which wouldn't raise any suspicion. Unfortunately that excluded almost everything. Skirts, shirts, trousers and so on were highly customized, and if he'd change into a skirt which Jennifer didn't recognize, that would probably make her suspicious. Same went for shoes. 

Underwear were nearly as ill suited, not to mention that David had absolutely no intention of hugging his sister's breasts or, even worse, be pressed against her bare privates. That had left him not many choices, but the type of clothing he'd settled upon was absolutely perfect for his venture. Grinning, he grabbed into the chaos and retrieved a pair of dark, black tights. Autumn was nearly over, but Jennifer seemed to have a weakness for skirts. Wearing such at near-freezing temperatures wasn't especially nice to legs, and so Daniel had often seen her using tights to protect her skin. Moreover, almost all times she went out to visit 'friends', she was wearing dark tights, a perfect opportunity for Daniel to exchange her garments with... himself. 

Now that the question of which type of clothing he'd become was answered, there was still another problem - changing back. The transformation potion would stay in effect for 24 hours, and then he would change back into a human. So if Jennifer was still wearing him 24 hours later, she would suddenly lose her tights and he'd stand next to her stark naked, prompting all kinds of unpleasant questions. Luckily, tights offered a promising solution here as well. He'd try to time his transformation with his sister's sports activities - right now in 24 hours, she had football training. And since she always went in tracksuit to the stadium, it was virtually certain that her tights - him - would stay here at home while she'd be away. Alone and unobserved while changing back. All in all, a perfect plan. 

Swiftly, Daniel started looking for tights now. He only found three pairs, but these were three too many. He had to make sure that there'd be only one pair to choose from, and so the three pairs vanished inconspicuously under Jennifer's bed. Daniel giggled again as he'd finished this part of his 'mission'. The plan probably wouldn't work with women who were more organized than his sister. If a girl would suddenly find a disheveled pair of tights lying in the middle of the room instead of neatly folded in the closet, she'd probably become suspicious. But not so his sister. She was actually expecting her clothes to litter the floor in untidy heaps. 

Daniel looked a last time at the vial. "Well then, 007..." he murmured to himself. "Time to start the mission." With these words, Daniel downed the contents of the vial and then quickly snipped it under the bed to get it out of sight. "Hm, mint...?" he muttered surprised, but in the next moments, he was gone - and only a pair of dark tights fluttered to the bottom, similar to those Daniel had deposited under the bed. There were differences, of course, but only noticeable when one looked very closely. Daniel hoped that Jennifer wouldn't look that closely. 

Oh, wow... he thought impressed. The producer was right... I can still see and hear. Which was about the only thing he still could do. The vial had actually worked and transformed him into nothing more than a pair of black tights. His whole body felt soft, and while he was completely paralyzed, he didn't feel numb. Only... empty. 

Well, of course I'm empty! Daniel contemplated. I have nobody wearing me, after all. But hopefully, that'll change soon... now only to wait for my dear sister...

In the end, he didn't have to wait long. It took Jennifer less than fifteen minutes to finish her shower and enter her room, and Daniel was glad for this. Somehow, he had a strange longing, a craving for something, somebody filling him out... I guess InaniMates opted for making the experience as pleasurable as possible, so that's probably the effect of the potion... still... It bothered him a bit that he literally couldn't wait until his sister would put him on. Before the change, being worn by his sister had simply been a necessary evil, nothing he'd looked forward to. Now, though... 

Humming, his sister started rummaging for clothes and Daniel felt awed by the magnificence of his disguise. This is awesome! he giggled inwardly. Here she is, my darling sister, naked in front of me and she has no idea I'm watching her!

Searching, her gaze swiveled through the room until it stopped on his shape, and Daniel realized that it was his time. In the next moment, he felt a warm hand grabbing him and taking him up. His sister made a small pout while she mustered him. 

"Hm, I could have sworn that I had more tights ready..." Then she shrugged. "Well, one is enough." And in the next moment, she started slipping Daniel on. He would've gasped, would he have been able of doing such a thing. It felt absolutely incredible how her warm leg slid into his body, how his soft skin hugged her legs. More and more of his body was draped over her legs and he felt as if he was in heaven. Until she slipped his crotch area over her groin. For a moment, Daniel's mind froze in utter shock as he felt his sister's genitals pressing into his fabric. 

Oh my God! She's not wearing panties! Why is she going commando? What the hell? Horrified, Daniel could only watch on as Jennifer adjusted him so that he was snugly hugging her in all places - especially in her groin. He hadn't gone for underwear because he'd had no wish of being draped over his sister's genitals. To prevent exactly what had happened now. And he had to bear with it for the next few hours. Just great... he groaned inwardly, but his mind was already flooded with new bliss as Jennifer started walking. He could feel every muscle shifting under her skin, every touch of his body against hers was total pleasure, even the pressure of her feet's soles. 

Swiftly, she donned a bra, a tight sweater-dress and then applied make-up. Afterwards, she slipped her feet into a pair of ankle-boots and posed in front of the mirror. Even Daniel had to concede that she was looking quite attractive, and the fact that the dark tights covering her legs were actually him...!

Hm, she should thank me... I'm actually making her legs look fabulous! The boy-turned tights thought while admiring the sight of his changed body accentuating every curve of his sister's legs. Jennifer seemed to agree with this assessment, because she blew her mirror-image a kiss. "Cooper will find me irresistible!" she giggled, a statement which made Daniel wake from his rather permanent state of stupor. 

Cooper? he thought while his sister grabbed her purse and walked out of her room, unknowing that the tights she was wearing were actually her brother. So she indeed has a boyfriend? Jackpot! He was already looking forward to all the secrets he'd uncover. The whole affair had something... thrilling. 

Although there wasn't much he was uncovering over the next fifteen minutes. Because as soon as Jennifer entered her car, he didn't see much anymore. Besides the pedals, that is. He couldn't even see where she was driving towards. A pair of tights didn't have that high a viewing point in a car to look out of the windows. Patience... he calmed himself while he reveled in the sensations Jennifer gave him when she was moving her legs to accelerate or brake. She won't stay in the car forever... 

Which she didn't. After a short drive, Jennifer parked her car and then walked towards a house. Daniel had no idea where they were, but from what he could see of the vicinity, this was probably one of the suburbs. But the where wasn't of great significance. Daniel's attention was firmly centered on the guy who opened the door now. He was large, broad shoulders but trim, with blond curls. Still young, but obviously a few years older than Jennifer herself. And given the fervency with which Jennifer threw her arms around the man and planted a kiss on his mouth, he wasn't just "a friend", either. Or the fervency with which his hands started to massage Jennifer's butt. 

Oh Jesus, please stop this! Daniel moaned inwardly. It felt so good how these strong hands kneaded and stroked his sister's ass through his fabric, but it was wrong on so many levels. He even felt how Jennifer's groin started to become wet, the fluid seeping into his body! But there was nothing he could do against the violation and therefore Daniel had to hope that it would be over soon. Finally, after what appeared to have been ages, the couple separated. 

"I've missed you, Baby." the man beamed now, giving Jennifer appreciative stares. "And you look beautiful. I love it when you're wearing tights!" 

Jennifer grinned back, doing a short twirl and driving a hand up and down her legs, making Daniel shiver inwardly with the touch. "Thank you, Cooper!" his sister giggled. "I didn't even know that I had these, but they feel awesome! I'm glad you like them!" 

"I know what you mean." Cooper smiled. "They feel... special. Anyway, please come in." 

Over the next couple of hours, Daniel learned almost every secret Jennifer had kept. She and Cooper had been a couple for almost a year and a half now, and they were even planning on attending the same college and living together then! Cooper's constant teasing of Jennifer's legs took a good deal of Daniel's self-control, but in light of the information he'd obtained, the sacrifice had been well worth it. 

Dad is going to buy me whole car for this goldmine... Daniel thought dazed. And not even a used one... no, there'll be a shiny, new... wait - WHAT? Daniel woke from his daydreams as he felt a most curious motion. He'd almost grown accustomed to Cooper's constant touch of his body, even started to like the strokes the big man was giving his girlfriend's tight-covered legs. But now, he was doing something different... something entirely different and if he'd still had a mouth, Daniel would have screamed in horror as he felt one of Cooper's hands slipping between his fabric and his sister's private parts. 

Oh my God... Daniel pleaded inwardly. Please don't do this... But he was totally powerless and therefore couldn't do more as watch on horrified as Cooper started finger his sisters - with him practically right inside the action. Being worn by his sister? Okay. Touching her privates? Awkward, but an occupational hazard. But being draped over her body while she had sex with her boyfriend? Please not! I'm so stupid! he cursed himself. Why hadn't I realized that, if she really has a boyfriend, there'd be a fair chance that she'd have sex with him - with me as her clothing right in the middle of it?!? 

Unfortunately, now it was too late and Daniel didn't have a say in the matter. He could only silently wait as he felt his sister's body in him becoming hotter, as he felt her juices seeping into his fabric. It didn't take long until raw desire took over the two humans and clothes started flying. A development desperate Daniel was actually welcoming. Finally... he thought distraught while Cooper was making Jennifer squeal in passion, his fingers expertly diving deep into her vagina. I'll still have to watch my sister having sex, but at least I won't have the impression that I'm doing incest... 

He already felt Jennifer's hands starting to pull him off her legs as Cooper grabbed her wrists. "Please don't." the boyfriend said with sparkling eyes, and Daniel's train of thoughts came to a shocked standstill. "I find tights totally sexy! And the thought of making love to you while you're wearing them...!"

For a few terrible moments, Jennifer said nothing. And then came the most excruciating sentence Daniel had ever heard in his life. 

"Sure, Baby."