A Train

"I want to fuck you while he fucks me," I said, out of breath.

"Dirty," she giggled.

Kate got to her feet and looked out of the hot tube to make sure the backyard was empty, then pulled the string to untie her bikini. As it fell away, I got my first look at her beautiful pussy.

She then walked over to the edge of the hot tub and got on her knees with her bare ass slightly out of the water. I got down behind her and buried my face between her cheeks. I licked from her clit to her asshole, taking in the smell of chlorine and pussy.

David positioned himself behind me and I felt my shorts being jerked down. Then I felt his tongue in my ass while he tugged on my cock. Then I felt the tip of one finger tease my asshole before plunging knuckle deep inside me.

"Fuck me already," Kate demanded, panting. "I'm on the pill. You don't have to pull out."

"Neither do you," I told David.

I positioned myself behind Kate, lining my cock up with her pussy. She was warm, wet and inviting as I slid into her. She wasn't as tight as David's ass had been, but there is just something about the feeling of a good pussy.

He continued to eat my ass for a minute as I thrust in and out of Kate, getting my asshole nice and stretched. Then got into position. I could feel him pressing against me.

"Twice in one night," he said softly in my ear. "What a little fuck slut."

Before I could respond, he plunged himself into me. This time there was less pain. My ass was ready for him. From that point on I was no longer fucking Kate. David was fucking my ass, driving me in and out of her pussy. She didn't seem to mind. She was cumming around my cock, using her arm to stifle her moans.

I came first, busting deep inside of Kate in was possibly the biggest orgasm of my life. For a minute I thought I was going to black out. David didn't let up, he kept fucking me like a slut, pounding my ass harder and harder. Just when I thought I was going to have to beg him to stop, he grabbed my by the hips and filled my bowels with his own cum.

When it was over, we all got our clothes back on in silence. Kate took a seat, but David headed for the ladder.

"Thanks for the fun," he said. "Maybe we can all catch up some other time."

I sat down next to Kate and stared at the water. In the heat of the moment my body had taken charge. In the afterglow of the act, I suddenly felt embarassed. Ashamed maybe. Not because I had sex with David as I had sex with David and the girl I liked was in on it. How could she ever look at me the same?

"That was fun," she said softly.

"I...I hope that was okay," I said nervously. "I don't know what came over me. I'm not into guys. I promise. It...it just kinda happened."

She gently took my hand, intertwining her fingers with my own.

"It was just sex, Alan," she said. "Who doesn't like to take it up the ass on occasion?"

She leaned over and kissed me.