Amy plays it cool, but you two struggle to get out.

"Heeeeeeey, Denise! Rebecca! What's up!" Amy says, quickly picking up the ball and stepping ahead of you. You offer a weak wave to the two girls as they walk up to you.

"Hey guys!" Denise says, "Sorry about that, Sam, you alright?"

"Yeah, I'm fine," you say. You still have one hand in front of your junk, and you notice Rebecca giving you an odd look.

"You sure?" the cheerleader asks, "you kinda look like crap."

"Rebecca!" Denise chides, elbowing her lightly.

"I mean, look, his face is all red, he's hunched over all weird..."

"Eh, Sam's just not much of a swimmer, but it's all good," Amy steps in, moving in front of you while you try to straighten up, position your hands as if you don't have something to hide behind them, and try to calm yourself down a bit. Amy herself, however, seems to be a far better actor, acting perfectly natural and idly spinning the beach ball in her hands.

"If you're not feeling up to it, why don't you head inside?" Denise suggests, "I think people were going to break out some movies or something soon, maybe some drinks or something--"

"Yeah, yeah, we'll be inside later," Amy interrupts, "you guys go have fun or whatever," she says as she spikes the ball up over Denise's head, who to her part, jumps up and catches it easily. Denise pops you a quizzical look, but you muster up your most convincing smile.

"Yeah, we'll catch you in a bit," you say. Denise seems to accept it, but Rebecca lingers, looking not at you, but at Amy. Your host takes a few steps closer, and Amy backs up only slightly, but enough to press herself into you. You take a sharp breath in as you feel the tip of your penis prod her back, but pass it off as a quick cough while Rebecca looks your friend up and down.

"...Nice top," Rebecca says after a moment, eyes narrowing down at Amy.

"Thanks!" Amy says, acting oblivious to the edge in her voice. Rebecca stares a moment longer, before sneering and turning to leave.

"Don't pull anything stupid at my party or I'm gonna be pissed," she says, swimming away.

"Wouldn't dream of it!" Amy says with a wave, holding a smile for just a little bit longer... before turning around and moving past you to the shore. "Alright, let's get the fuck out of here before anyone else sees us."

"R-right," you say, following alongside her. The two of you finally get yourselves out of sight of the rest of the partygoers, tucked away behind some overgrown bushes, but you still need to climb out of the water. "Sorry about, uh.... prodding you there a second ago," you say, rubbing one of your arms.

"What?" she looks back at you, offering a short chuckle before looking back to the ledge you'll have to climb out of the lake, "Oh, it's cool, I didn't even feel anything. I-I don't mean like that!" she says, turning back, an awkward but nervous laugh creeping into her voice as she catches a half-disappointed look on your face. "I mean, I wasn't really paying attention and, y'know it's probably the cold water.... I mean, I've seen you in gym shorts, you can tell it's a decent size, I just..." Amy trails off; you aren't even looking at her anymore, blushing and staring down into the water at the discussion of your size, and the revelation that Amy had apparently thought about it previously. Amy herself is looking a bit red as she places her hands on the rocky ledge. "Let's just get out of here."

You look up to say something in agreement, but the words die in your throat as you watch Amy try and lift herself out of the water. With a grunt of effort, Amy hoists herself up enough that her lower half breaks the surface, her massive ass sticking straight out in your direction. Each meaty cheek jiggles like mad as she kicks and tries to climb up the rest of the way, before falling backwards into the water. With a deep breath, she tries again, mooning you in an attempt to pull herself up out of the lake, until you hear a metallic ping and she slides back into the water, seemingly of her own volition this time.

“You—“ you cough, mouth having gone dry as you stood there staring, “you okay?” You notice your friend has sunken lower in the water, up to her neck. With a deep sigh, she slides the straps off her shoulders and holds up her bra.

“The fucking... clasp on the front just snapped apart,” she said, unceremoniously dropping it into the water, her other hand over her chest, “I mean, fuck it, right? Why not, at this point?“ You shake your head, even as Amy’s incredulous laughter brings a small smile to your own face. “Anyway, I’m, uh, going to need a hand up.” Amy nods her head to the ledge and waits for you to come closer.

“You sure?” You ask, “I mean...”

“Look man, might as well tackle this super awkward stuff head on, right? Now get over here and gimme a boost!” With a gulp, you position yourself behind Amy who, with a quick but shaky smile hoists herself up once more. For a moment, your view is entirely taken up by Amy’s big, bare butt, and you feel your penis stirring despite the water. You put your hands out to catch her as she starts sliding backwards, one hand catching her foot, while the other goes straight onto her ass as a reflex of it almost crashing right into your face.

“S-sorry!” You call at Amy’s surprised yelp, quickly moving your other hand to her other foot, while quietly savoring the way it felt to grab and squeeze her wonderfully fat ass. Swallowing such thoughts for the moment, you give her a push from the legs up, and soon she’s on land. She turns to stare down at you, and for a moment you’re worried she might be mad, but if she is she doesn’t show it.

“Alright,” she says, “your turn.” Amy’s kneeling, on the ledge, her legs turned in such a way that you can’t see between them, but with one arm holding onto a low tree branch for balance and the other stretching out for yours, she isn’t bothering to hide her sizable chest since discarding her last piece of cover, brown nipples erect from the cold of the breeze playing over her wet skin. You reach out and take her hand; for a moment you still keep one over your half-erect cock, quickly clasp hers with both of yours as you scramble for a foot hold to push up into her yanking you up. The motion carries her to her feet, then stepping backwards as you stumble into her, and then down as you fall over on top of her, the two of you coming to rest on the root-woven soil of dry land. You’re hunched over on top of her for a moment, hands on the ground on either side of her head holding up your weight, her hands around each of your wrists as she still makes no move to cover her chest. Her legs are splayed open, with you kneeling in between them; you dare not look down at the last bit of privacy she’s kept from you, but you have to stifle a moan as the head of your cock brushes against her thigh. Your eyes stay locked with hers (or rather, her one eye not obscured by the long wet bangs that fell into place when she fell over), and for a moment the two of you stay in that position, breathing heavily before you each come to your senses and roll away from the other. You quickly cover yourself back up, a difficult prospect for your fully erect self, before Amy breaks the silence.

“...Water’s cold, but you warmed up quick huh?”

“What?”

“I’m just saying, I definitely felt it that time.” You let out a groan and clasp your traitorous tackle tighter, while Amy lets out a short laugh. “C’mon, dude, plenty of time to feel embarrassed about it later,” you aren’t looking, but can hear the leaves on the ground brushing aside as Amy rises to her feet, “the front door should be unlocked, and I think everyone’s in the back, right? Getting back to that guest room should be a piece of cake!”

“I hope so,” you sigh, standing up as well, and join Amy at the tree-line facing Rebecca’s cabin, mentally preparing yourselves to make a break for it.

“Ready?” Amy asks.