A young man at the beach with his sister and her boyfriend

When Calem's sister, Vanessa, had invited him to the beach with her, he had jumped at the opportunity. He loved his sister dearly and always took any chance he had to hang out with her, especially once they both hit adulthood and college. He was less enthused when he realized his sister had also invited her current in a long line of boyfriends, Richter. Calem never really liked any of them, thinking they were never really honest in their intentions for dating his younger sister. It didn't help that Vanessa clearly had a type; every one of her boyfriends were all clearly muscular, a trait Calem lacked and envied. He was still slim, but he had never really been able to put on any muscle mass. Now at the beach, surrounded by jacked guys and with his sister occupied with her boyfriend, he was beginning to wonder why he had bothered coming.

'At least the eye candy is good,' he thought, looking around at all the swimsuit-clad women roaming around. Quite a few of them were particularly beautiful too. Lots of the men were absolute powerhouses too, ruggedly handsome and muscular in the ****, to the point that Calem's **** mood was beginning to fail. Pushing himself up before he could dwell on it too much more, he decided to get something to drink to occupy himself.

Walking over to one of the food stands, Calem had to dodge around a couple stumbling towards him that were apparently attached at the lips. They had to be, given how furiously they were making out with each other as they staggered around, moving vaguely in the direction of one of the bathrooms. Calem eyed them, noting the bulge in the man's pants and the press of the woman's chest against his, and left them to it, knowing exactly what they were planning.

'At least they're enjoying themselves,' he thought, stepping up the the counter.

"I'll take a... let's go with a milkshake," he said, looking up at the menu.

"Sure thing, baby," the woman behind the counter said, her large boobs bouncing in her top as she shuffled around and mixed the drink. "The milk's fresh, hope you like it," she said, handing him the drink in a tall paper cup. Giving a half-hearted smile and paying, Calem walked away, taking a long pull of the drink.

He walked and drank, wandering around the beach. He noticed more beautiful women everywhere, soft paragons of femininity walking, standing, laying down, sucking dicks. The last one didn't seem quite right, but Calem shrugged it off and took another drink of his milkshake. It was an adult beach after all, and it hardly looked like the ones being sucked off were unwilling. In fact, they seemed to be greatly enjoying it. Calem wondered if he asked if one of the women would do the same for him. He could feel his dick hardening at the thought, or had it been hard before? He took another drink and moved on.

After a few more minutes, Calem turned around and started heading back to where his sister's things were. He wanted to lay down a little, as his arms and legs felt a little sore. Muscles all over his body twitched involuntarily, tightening and releasing at random. Calem tried massaging his chest a little, but that didn't seem to help. He flexed his arms, trying to make them stop seizing, only to find that he had a lot more there than he had before.

His biceps were bigger and had thick veins tracing over them. He flexed them, reveling in their increased power as he drank the last of his milkshake. He traced his chest and was extremely pleased with its size and sculpting. He did the same with his abs, clenching each one in turn. He could hardly believe it, but he had somehow gained 30 pounds of muscle in just a few minutes. Not to mention that his dick was half-hard in his shorts, forming a notable tent in them.

Tossing away his empty cup, he walked with new confidence towards where he could see his sister standing over her things. He had never really noticed before, but his sister really was gorgeous, with a nice, round face, long black hair the same color as his own, a fine bottom and, what had always drawn men to her, large firm breasts. It was a shame she always attracted the worst sort of guys, the kind that didn't care for how kind and caring she was and only focused on the pair of tits attached to her. Calem had never had the nerve to stand up to them or confront his sister, but now, with his new frame, he felt confident enough to speak his mind.

Steeling himself for confrontation, Calem walked purposefully towards Vanessa, eyes fixed firmly on her back. He was just about to open his mouth to call out to her when she bent over to dig something out of her bag. Calem's words died in his mouth as his eyes rolled down her bending spine and landed on her pushed out ass. He went from half hard to full mast in an instant, suddenly full of lust for his sister instead of love. He felt it burning inside him, the need to possess her so that no other man could have her. They all were undeserving of her, but he, he knew her worth.