I was so horny that I was tempted to just whip it out right there and stroke it for everyone to see. But not wanting to run the risk of being arrested... I pulled my swim trunks and shirt back on, grabbed the rest of my stuff, and headed back to the house.I was so eager to jerk off, I couldn't wait to get back to the house. When I got back there, I dropped everything quickly, and immediately headed to their pool in the backyard. As soon as I got there, sitting by the pool I ripped off my shirt. I pressed her butt over the jeans and put my hand in her panty and cupped her butt, and slid my index finger in her ass crack.She was wet like hell and had drenched her panty. In a jiffy, her pants were off and she wanted me to fuck her.I wanted to tease her more and was fingering her and kissing her body and started to suck her boobs and nibble her nipples lightly, for which she moaned ah.And went down a bit and kissed her thighs and kissed. While pressing her pussy mound, I slowly moved. "Dave, what's bothering you? Huh? You can tell me." I said to him, with my arm around his shoulders. He looked down to the ground and finally spit it out."While I was walking with Chris he told me he liked me and wanted to....that he wanted to.....ummmm....have sex with me." David said and my heart dropped. "That's not the worst part thought, Kyle. I told him that I wanted to do it with him also and I'd ask you if we could do it."I couldn't believe what I was hearing. I had to sit down to fully. Sis: Are you saying there are more positions like this?Me: Yes sis there are.She was moaning even more. She reached an orgasm and I was also on the edge of cumming. I started to move my hip along with her and she was screaming in pleasure.Me: I gonna cum.Sis: Cum inside me. Don’t spill it out.She came again and I cummed inside her. We slept hugging each other. The next day came. I left for college as usual and when I came back she hugged and kissed me in the lips.“Come on let’s enjoy it because.