I always had a thing for my sister Serena. Since we where kids I looked at her differently than I did other girls I liked. But it wasn't until three summers ago that things changed between us. It was the summer after my 19th birthday.
Serena was 24 and had been away at college for six years. She had graduated so now she came home for a while. Every holiday, if she could, Serena would come home and the air in the house was always a little strange. I had never seen her as my sister, only as the object of my lust. She had changed a lot since we where kids. Her dark tan skin glistened in the sun on those hot summer days. She spent most of her days at home outside under the sun, or taking short dips in the pool. Her body sent shivers down my back when she paraded around the house in the tiny bikini. Her perfectly round breasts never fell out of her top as she bounced around. Her beautifully sculpted ass almost made me hard every time I saw it.
On my days off I would stay at home with Serena. When she first came back I would watch her through my window as she swam or sun bathed. One day I worked up the courage to join her. I donned my favorite trunks and bounded down the stairs. The very thought of being that close to such a beautiful girl made my penis take notice and perk up a bit. As I walked outside she didn't budge. I was pretty sure she was asleep so I took a moment to stare at her perfectly portioned form. It was such a more provocative view up close than it was from my second floor window. My dick was fully erect by now and I needed to get rid of it before she woke up.
I walked to the diving board and with a running start leaped off in her direction with a cannonball. The splash hit her and she sat straight up.
"What the hell Jason?"
"Sorry sis, you looked hot so I thought I'd cool you off." I was never going to let on the truth. I just wanted her to chase me into the pool so I could get and excuse to touch her.