I was too far along to stop now, but I also respected her….so instead of fucking her, I just slid my cock up and down between the naked cheeks of he... ass. She pushed back wanting more, but afraid. “Does it count as cheating if I fuck your ass instead?”She looked back at me. Her eyes half closed. Her voice trembled. “Yes…oh god, please…fuck me there….it won’t count…it won’t. Fuck my ass.”I grabbed my hard shaft again and this time slide it up and down through her wetness, between her. “Nothing. Just family stuff. Trust me.”“Suit yourself,” she said, and tossed me a beer. I caught it and moved out into the living room. We sat on the couch, sipping beer until the sun went down. All the while, we filled each other in on our summers. Carrie had turned 21 while we were apart, and it bothered her that we couldn’t be together openly. It dawned on me that her birthday had fallen on the morning I had woken up next to my sister, and I felt a hollow pit of guilt open up in my. ..."Please..." Mmmm, please, what?" Please Terri, may I touch my pussy?"She appears thoughtful for just a moment."No."You moan in frustration, but without surprise. She never lets you satisfy yourself without working for it. Now being driven crazy by your need to touch yourself, you begin rubbing your legs together."Uh-uh," Terri chides you. "Spread those legs wide, dear." Oh Terri PLEASE... please I need it so bad...." Nope!" she says smugly.Your man is loving the entire performance... as. After a couple more minutes I slid my hand down to her breasts and start fondling them through her bra. She didn’t resist so I also put her hand on my now exposed throbbing cock. She was enjoying every minute of what I was doing. I reached around and unhooked her bra and pulled down her shoulder straps, exposing her beautiful brown tits with great big nipples that were erect just waiting for me to suck them. We continued kissing each other while I squeezed her tits and then started sucking.