Over Erin's 19 years, he had always had one craving that was completely unsatisfied... His sister. Carmen was a year younger than him and since he hit puberty he'd seen her in a new light, a sexier light. Once or twice things had been very close between them, but both of them both knew how much it would ruin their brother-sister relationship if either said anything, so it was always kept secret. Both acting as if nothing was ever there. These were Erin's thoughts anyway, but he had always hoped she more than just liked him.
On his 19th birthday Erin decided it was time to make a move, but despite all his hormones screaming at him he couldn't do it. He needed a plan, and knew just what he could do. Carmen was a beautiful girl, her young pert breasts being the cause of many erections on Erin's part. She was short for her age, but perfectly proportioned with an ass that could only be dreamed about. And often was for Erin. Recently she had taken to wearing rather short skirts and watching TV constantly, Erin always joined her just for the chance of a quick glance at her snatch, unfortunately she appeared to have sussed out his idea and sat facing away from him, legs crossed.
Erin one day realised his chance as they were swimming down the local pool, the changing rooms... Pretending he was bored as soon as they got in they decided to leave early, and Erin seized his chance, tactfully choosing the adjacent changing room to hers. Getting down on all fours he quickly peeked a glance under the partition which had a gap underneath, he saw his sisters smooth legs wandering around the spacious changing room, and pushing his head forward increased his view, only to be disappointed to find she hadn't taken her bikini off yet. Waiting with baited breath and a hand to his unstoppable hard-on, he peered forward so he could see her breasts, which to his disappointment were currently being dried with a towel, but as she lowered he hands to dry her stomach, he almost came as he saw her beautiful nipples and unbeatable tits, his hand naturally started going faster, and he forced himself to stop before he climaxed.