My boyfriend Rob has been an important part of my and my sister Alexandria's lives. When I went overseas for college last year, he and Alex hung out as friends. Alex was always quieter and less outgoing than me and never really dated, so, when I came back to the States, she often came with us to the movies, out on a picnic, or to parties.
On New Years eve last year Rob and I had a party at our apartment. It was very successful, and a lot of people turned up. Alex met a guy and spent most of the evening dancing with him. But, when it was all over, I found her sitting on my bed crying in the dark. They'd had an argument about her going home with him, and he had called her a bitch and a tease.
I was able to cheer her up a bit, and Alex helped me tidy up the place. Rob and I went to bed, and Alex crashed on the couch. About three in the morning, Alex came in and got into bed next to me I cuddled her, and we went to sleep. A couple hours later I woke up to Rob moaning in his sleep. I opened my eyes, and saw Alex reaching across me gently rubbing his cock through his shorts. I felt shocked at first, but then I thought - I trust and love them both.
I touched her arm and whispered into her ear, "Let's wake him up and give him a surprise." So I called in his ear, and he woke up.
He looked at me, then he looked at Alex, and he felt a hand on his cock, and didn't know whose it was, and he just said quietly, "Oh, boy."
The situation turned us all on. I started kissing Rob as Alex slid over me and went down on him, sucking his cock. I peeled my soaked panties of and, climbed on top of him as Alex pushed his cock, wet with her spit and his precum, inside me. I stroked back and forth, dragging my clit against his stomach while Alex made out with him. After a few minutes, Alex looked up at me pleading, and I slid forward onto his stomach. I kept grinding my clit on him as Alex climbed up behind me and mounted him. She moaned and went to town riding him. She was so excited she only lasted a minute before she came. I felt her arms wrap around me, pulling my back against her tits. Rob grabbed my hips and pushed his cock deep into my sister as he shuddered and came.
Afterwards, Rob licked me until I came as Alex held me and stroked my nipples. Sweaty and tired, the three of us cuddled together and slept as the dawn broke.
Rob and I woke after noon to find gone. I think that was the best way. Rob is awesome, but Alex and me needed to talk first. We spent hours debating what had happened and what would happen in the future. But regardless, we both agreed we loved each other. In mid-January, Alex showed up and joined us again. Since then we've had sex with as a threesome once or twice a week. Alex lets herself in and joins us. Sometimes for play and sometimes just to cuddle. Since then Alex started seeing a guy regularly, but she still loves sharing Rob with me.
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