Enlargement and Arousal

Jessica suggests that the group change into their swimsuits while she makes a batch of lemonade. She slips in her prepared pills, a 50% enlargement pill, and a pill to cause unpredictable and persistent erections, confident that her friends will enjoy the effects.

As she mixes everything together she watches each of the group come out of the small bathroom in turns wearing their swimwear. Josh is shirtless wearing some fairly boring swim trunks, though she doesn't think they will be boring for long. Natasha is wearing a barely-there string bikini with a thong bottom that is causing Josh to keep quickly glancing over in her direction. Tina is wearing a more standard two-piece that almost completely covers her ass, and Amy is wearing boy-shorts and a swim-shirt. Jessica quickly changes into her own conservative one-piece then passes out the lemonade. She is just able to detect the taste but if any of the others can they aren't showing it as they sip down their drinks. She can't help but smile as she briefly catches Josh's eye, excited for what is to come.

There are some bikes outside the cabin for the group to ride to the beach, and Jessica collects the groups towels, conveniently forgetting to put them in her basket, with the group bringing only a tube of sunscreen, a volleyball, and the bathing suits on their bodies.

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Josh thought the lemonade might have been a bit expired, but he didn't want to embarrass Jessica by saying anything. He still felt very out of place here and was content to quietly listen in on their conversation while trying not to ogle Natasha too openly.

The group leaves for the beach, following Jessica, who had been here before, through a series of twists and turns going through a small town center before finally arriving at a small secluded beach. There is no car parking here and no bathrooms or other facilities leaving the beach empty other than their group today. Almost as soon as he gets off his bike he notices an unfortunate tightening in his suit. He needed to stop staring at Natasha. It is starting to affect him, and he doesn't want his step sister and her friends to think that he's a creep.

"Josh, can you get my back?" Jessica asks, handing him the sunscreen and turning away from him. He takes it before he can even think not to. As he spreads it across her back all is lost. He is at full mast, and he is feeling harder than he ever has before. He's gotten hard in this suit before and he didn't think it got quite this tight then.

"A bit lower? You have to go right up to the bottoms. Get inside them a bit even"

As he gently rubs the top of Natasha's ample backside he tries to politely look away and he notices that Amy is clearly looking at his bulge, and doesn't even notice him watching her. He flushes pure scarlet with humiliation. Amy knows that he is getting hard from this and soon all the girls will.

"I think that's enough on my butt" Natasha says wiggling it at him" He must have zoned out a bit.

"Sorry" he says pulling away.

"I'll do you now"

He has no choice but to turn around and face Amy, Tina, and Jessica as Natasha runs her hands down his back. All three look back at him and he is sure they all know. Amy is still staring transfixed, Tina is smirking and Jessica meets his eyes with a wide smile. Natasha is being a little overly thorough for his taste and seems to be going deeper into his suit than seems strictly necessary. She has 4 fingers inside his waistband up to her knuckles and is massaging the cream into the top of his ass. Finally she pulls away and he looks around desperately for some sort of way to cover up.