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This is a sequel, it starts exactly where first story 'Wish' ended
Deeply rewritten. Better dialogs and more descriptions. Enjoy
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  "Okay, wish her luck, I'm with Andrew here and she's alone, no wonder she goes after that Philip guy", - Linda thought.
"He looks nice, apparently alone here, she knew him before, she says he is kinda neighbor or a college-mate. Though, something is strange with him, unnatural"
Oddity of Phil was sneaking of girls mind, so she gave up soon, paying attention to silvery fishes beneath. Several minutes later she glanced at the isle again, to her surprise rock was empty, no traces of Phil and Sue.

Sue swam, holding neatly folded Phil in left hand, between her stomach and tight vinyl surface of airbed. Thought struck her: what if he slips out her fingers and sink? Susan was not very good diver, frankly speaking, not a diver at all. She would never get Phil from the bottom and asking someone to do it didn't seem like a good idea. So she was doing her best not to lose Phil.
Deflating him that way, was a stupid thing, she admitted, however, she did not feel sorry. He'll forgive me, no doubt, by the way, he has no other options. Interesting, does he have a girlfriend? If so she'll be mad. Not only he is completely naked in my company, he is now a blowup boy, well, what is worse? Cheating or being inflatable? To Sues taste, former was a reason for homicide, while latter was merely odd, even weird, may be funny, uncomfortable to introduce to friends, just listen :"That's Phil, my inflatable boyfriend". Man, frightened by needle, what a nonsense. Whole this stuff is nonsense. Its against laws of physics, isn't it? Guys can not be inflatable, right? Well, they can, yet they should not be living, moving, attractive. Inanimate objects. Despite her best efforts, she  couldn't remember any law of physics forbidding existence of living inflatable guys. Magic? What is magic? Is it against some physical laws?
Shore was already near, Sue wanted to escape questions. On the other hand, pump was in the bag right under Andrew's elbow. Ideally, she hoped to leave air mattress at beach, take pump and leave to some empty place without explaining anything about Phil's swims and strange flesh-colored rolled-up thingy in her hands. An idea came to her mind.
Once in the shallow waters near coast, Sue descended into water, put Phil onto bouncing vinyl surface and pulled the plug, this time it was mattress plug. Air hissing made her once again remember unreal scene of deflating Phil, impossibility of what she has seen with her eyes struck her as crowbar wrapped into thick rug does: softly but stunningly. Was it a dream, or hallucination? Everything around seemed so real, including her deflated neighbor , totally at her mercy. She once again touched him, then violently nipped herself at the shoulder. Nothing happened. As they say, if you are not sure whether you are dreaming or awake, is the world real or not, keep acting as if it is real. It doesn't change anything in first case, and does less harm in second. With these thoughts in her head, Sue took limp mattress and started to wrap boy in it, while squeezing  remaining air. This was almost done, when she approached improvised camp.
Linda eyed her with many questions to ask.
"Leaving already?" She told instead, trying to assume uninterested face.
"Not yet, just moving to some other place", - Sue replied.
"Why? Oh, I can not believe, you are with Phil, already. Isn't it too ... fast?"
"Nope. I control the situation, relax, I'll be fine", - now it was Sue's turn to assume confident face.
"By the way, who is that Phil guy?" Andrew asked.
"Oh you don't know him, honey, he is kind of neighbor or college friend. Sue and I never expected to meet him there, right? But now she looks rather electrified. Let them have nice day, and we'll do the same, right?"
In the mean time, Sue picked the pump up,  said bye and looked for the solitary corner. Shore was too populated, sloped hills nearby - within view. However, grove after hilltop seemed comfortable. She was still in her wet bikini, and felt cold a bit, however, among trees wind was less irritating. Suitable clearing appeared soon.
Does he hear whats happening, and what does he think about me, Sue thought. Will he forgive me and if not, should I inflate him now? Is it painful or inconvenient to be bent and rolled that way? Oh my. What have I done. With this in mind, she quickly unwrapped mattress and inserted hose into plug in Phil's back. Size was not precisely matching, however, plug stretched a bit. Then Sue started to pump. She was so occupied and never noticed that she is observed.

Linda had seen enough to conclude that her friend has lost her mind completely. Or was about to have sex on the first date. She couldn't decide which option is worse, so she quickly followed Sue, Andrew chose to stay at place, however. He did not mind sex on first date, nor erratic behavior of Sue.
Linda thought: Is he that hot? To fuck him right now? That will spoil everything. Sue looked so much moved by something, and why does she go alone there. Very very odd it is, I'll just look after them and wouldn't interfere if she would not do anything really stupid. However, what she had finally seen was much stranger then she ever could imagine. Sue was alone, and pumping. Hey, isn't boy supposed to inflate bed? Linda stepped a little bit closer, with a risk of being revealed. Pump wasn't connected to mattress, Sue was inflating very natural looking inflatable doll, it looked like naked guy. It was still limp and crumpled, yet getting smoothed with every portion of air. Head, oddly resembling Phil's face, got almost inflated to normal state, it was detailed very realistically. Linda had never seen such a blowup doll. Then partly inflated doll, moved slightly and said.
"Oh, whats happened to me?" Phil looked at Sue, her bust, then finally at pump in her hands.
"I've brought you here, I'm really sorry. Will you forgive me?", - There were so much remorse in her voice, she was pumping him up and could stop at any moment, lastly she had ample boobs tightened by wet swimsuit, thats why Phil's resent faded quickly.
"Wait. A minute before we were on that isle, you did that thing, umm, deflated me, right? And now we are here, in the forest"
"Yes, I had to find a safe place. I hope that was not painful?"
"On the opposite, I'd say it was even pleasant. As if, well, difficult to compare. Aren't you tired of pumping?", - besides politeness, Phil really hoped she wouldn't stop now, his own strength was still lacking.
"No, not really. I'm so glad, you aren't angry. I was so stupid", she observed her work and continued: "Wait a minute or two, you are not fully inflated yet". She continued to blow him up, watching how his torso regained volume and taut, creases vanished.
"I'm confused, not angry. By the way, thanks for you help, you could just leave me and you didn't"
"Cool. Don't you mind my looking at your nude butt?"
"Not really. Of course, if you have my swims there, do you?"
"Yes, I do. Wanna take it on right now?" She stopped pumping for a second, gave Phil his garments and closed eyes. Well, almost.

"I think I'm inflated. Thanks again", - He tried to reach his plug.
"No, no, you were, bigger, Sue protested" She did few pumps more. - Much bigger. And now you look skinny, I'm going to fix that, she smiled.
Phil listened to feeling of air filling and bloating him. His muscles started to bulge again, he also felt his chest, hips, butt, and belly expanding slightly.
"Done?", - He asked.
"Not yet, wait a bit more, be patient"
He stopped to grow taller completely, future air intake widening him instead, skin continued to stretch, butt filled swims completely, so restrained air moved to hips.
"Do you think, I'm balloon? Well, we may try this some other time, do you mind?"
"Do you promise, right?"
Phil agreed hastily: "OK, deal"
She pulled hose back and quickly sealed the plug.
Boy lied few seconds bathing in all that new sensations: "Never felt so good. By the way, I hope, you didn't told anybody?", -He said, blissful smile faded a bit.
"No, I didn't. And what will we do next?", - She murmured.
"I have an idea"
And they kissed. First gingerly, and then with more and more lust. Phil's embrace was tight and in the same moment gentle. His new body seemed to be very good at that aspect. Sue wondered about other body parts. At that moment shocked Linda decided to silently leave her observational position. Sadly, she stepped on the dry stick. Moment for Sue and Phil was destroyed completely, they both stared at the direction of noise.
"Who is there?", - Phil shouted.
"Oh it is me, Linda, I just wanted to make sure, you are fine, you left so long ago, I was so worried, I'm sorry for interrupting"
"What did you see?", - his voice was quite serious, unlike his looks.
"I've seen you guys kissing, I'm sorry, again, I've spoiled the moment. I'm already leaving", - Linda was talented lier.
However, Sue has known her for long enough: "I guess you have seen more. Not very kind of you, and stop wriggling out", -  She said.
"Well, may be a little more. And I don't understand what I have seen, frankly. At least, I hope, you wouldn't kill me to keep the secret?"
"I'll kill you if you won't keep your mouth shut about that, anyway it wasn't your business even would he be plain flesh and bone guy"
"Please, calm down you two", - Phil's voice was surprisingly cold and confident. "We'll deal with this later. Now I have to seriously ask you to keep secret, right..."
Linda, interrupted him and told to Sue instead: "huh, let it be secret, nobody will know you have a blowup boyfriend. Oh I didn't want to insult anybody, still this looks really funny. Well, I'd better go"
And she left.

"How she dare", - Sue was boiling.
"Well, technically she is right. I'm blowup. And I'm your boyfriend now, right?"
"Yep, you are. Now give me your special blownup hug".

To be continued.