I had come home after working all night to find my girlfriend, Cheryl, passed out in our bed after a hard night of drinking. In bed with her, naked, was her best friend, Sara. It was quite a surprise, as neither was bi. As I fantasized about what might have been and what might be yet to come, Sara awoke. Rather than being embarrassed by being caught, she invited me into the bed and between her thighs. It was a threesome in the making. But Sara and I got carried away in our fucking. I came inside of her, and we kissed like lovers.
Meanwhile, Cheryl was still asleep, lightly snoring with her eyes closed. She didn't know.
We'd expected her to wake and either join us or scold us. But now we had to make a very hard decision. The deed was done, and we had to choose whether or not to tell her about it.
Sara and I both came to this realization at the same time. We saw it in each other's eyes. And then we saw the answer.
We jumped off the bed and ran out of the room, closing the door behind us. We were kissing again with as much passion as we had during our recent mutual orgasm before we even reached the couch...
Sara dropped to her knees.
"God, I need that cock," she growled as she stuffed it into her mouth.
I had cum just two or three minutes ago, so I wasn't hard. In fact, I was still softening down from my original erection. But Sara didn't care. When I didn't grow again right away, she ducked under to my testicles, opening wide and taking them in a deep mouthful, then sucking. Sucking so hard she was almost swallowing them down. Below, she was fingering herself, and I saw her bring the fingers that had just been inside her up to her lips. The fingers glistened from a coating of something thick--the cum I'd shot inside her--and she stopping sucking my balls so she could lick it off.
She looked up and saw me watching her. Briefly, we waited for the other to do something. Then we both moved to the couch, me on my back and Sara falling on top of me. We were kissing again.
It was thrilling, but strange. The cheating factor, the excitement and wrongness of it all was apparent through our fucking, but even when Sara had her face buried between my legs, it still didn't feel like we were really breaking any rules unless we were kissing. It was as though a purely physical relationship could be forgiven, but kissing was more personal, and therefore inexcusable. But we had already crossed the line, so being bad only made it all feel better. We made out with animalistic intensity. Our tongues begged for more. I couldn't get enough of her.
We kissed long and hard, enough to give my cock time to grow again. And as soon as it did we were off and fucking. Sara slipped under me and we did it missionary like that for a while, but then Sara sat up on me, riding me, and I watched her enormous tits bounce as she thrust herself against me. They were so beautiful that I let go of her hips and held her breasts as I fucked her, squeezing them and pushing them together, rubbing my thumbs over the big, hard nipples. She responded by pushing against my hands. I had lusted for but never touched breasts this size before. I was in Heaven.
The fucking was amazing, but we both wanted so much more. Sara climbed off of me and moved down. She grabbed my dick, lowered her mouth--
A cough, from the bedroom.
We both froze. Cheryl was awake. And she'd be alarmed. If she remembered what had happened between her and Sara last night, she'd be panicked. Sara's absence from the bed didn't mean much--only that Sara had woken first and maybe went home. But the morning light meant that I was home, and Cheryl would worry about what I had already seen or figured out from the clues left from last night. She would be up and out of the bedroom in no time to see if either I, or Sara, or both of us, were here.
And there was one big problem with that: all of our clothes were in the hamper next to the bed.