When I was growing up, I lived with my mother, father, and my twin sister Rachel. My parents were pretty wealthy and had a really nice pool. Rachel and I would often chill near or in the pool. When we were teenagers, I started noticing how attractive Rachel was. Almost everything about her was amazing: her eyes, lips, body, breasts, butt, etc. She would wear bikinis when we sat outside sunbathing. As a horny teenage boy, I'd get an erection often. At first I'd let it be and hide it as best as possible. Then I became more daring and slipped into the hot tub attached to the pool to jerk off with my sister just 20 feet away.
One day, when we were 15, we were sitting outside like usual. She looked particularly good that day, with her skimpy bikini barely covering her perfectly round breasts. I slipped into the hot tub to relieve myself when I noticed she was sleeping. Feeling daring that day, I got out of the tub with my seven inch cock making a giant tent in my bathing suit, and walked up to her reclining chair. I said her name to make sure she was asleep. When I heard no response, I whipped out my hard dick and began to stroke it. The water on it helped to lubricate it a little bit. The urge to cum came on quickly, but I fought to make it last as long as possible. I soon couldn't take it anymore, and I shot a giant load onto my sisters stomach and breasts.
Although this wank felt so good, cleanup was gonna be a bitch. I grabbed a beach towel and, as lightly as possble, started to wipe up my cum. But then my sister woke up as I patted her perfect tits with my towel. When she woke up she saw cum all over her, and she knew it was mine. At first she didn't say anything, but then she addressed me. 'You naughty boy. I'm gonna have to punish you.' She got up and walked toward me. By this point I had retreated to the pool's edge. She came up to me and pushed me in with all her might. She dove in after me and when we met under water something unexpected happened, she ripped off my swimsuit, leaving me completely naked with a quickly growing erection. I quickly swam to the wall to recover. My sister followed. She grabbed my dick from behind and started stroking. I couldn't believe it. Was this her punishment? It sure was.
She gave me the best handjob I'd ever had, better than any of the other five girls that had tried before her. I quickly came, my semen mixing into the pool water. I turned around to see her playing with herself. I wanted in on the fun. I reached underwater to find her delicate pussy and jammed my finger in too. Hers quickly left letting me take the lead in making my sister orgasm. After a minute, she orgasmed and let out a beautiful moaning sound.
Afterward, we climbed out of the pool completely naked and dried ourselves off with the original cum covered towel. We then took a shower together and helped each other get off again. The next day, we sat on two recliners next to each other and pleasured our twin out in the open. We continued to do that for some time until she got a boyfriend and decided it was immoral.
I still have never had a handjob better than the one Rachel gave me.