“It feels wonderful,” he said.

“I’m glad,” I told him honestly before I started to grind back against him.

“Kim, you said I don’t have to fuck you,” he protested half-heartedly.

I nodded, “I know, but I never said I wouldn’t fuck you.” The slow-motion of grinding **** more of his cock into my cunt, and I shuddered.

“Are you going to cum again?” he asked.

I nodded, “If you keep squeezing my tit while I grind on you, yes.”

He grunted, “I don’t think this is grinding. I think this is fucking.” He told me as his hand started to squeeze my breast again.

I sighed, “I don’t care. It’s lovely,” I confessed.

I felt him start to push into me, moving his hips slowly as I did. We found a rhythm, and soon he was much deeper. “Jethro?”

“Yes, Sis,” he panted.

“If I asked you to cum in me, would that make me a bad sister?” I asked.

He continued to slowly piston in and out of me as he said, “No, it would make you a bad girlfriend.” Suddenly he stopped, “Sorry. I didn’t mean….”

I smiled and shook my head again, “It doesn’t make me a bad girlfriend.” I told him, “It’s one of Mark’s fantasies.”

He groaned and started fucking me again in long slow strokes. “One of your boyfriend’s fantasies is for you to fuck your brother?” he asked.

I nodded, “And I think, after tonight, it’s one of mine.” He moaned and squeezed my breast tighter. “Ooh, are you going to cum?” I asked.

“I’m close,” he panted, “We should stop.”

I shook my head, “Not until you can sleep.” I told him as I continued to push back against him.

“Kim, I can’t cum in you, your my sister, and I can’t cum on the bed, or it will be obvious tomorrow.” He tried to rationalise. “Maybe you could swallow.”

I moaned, “Is my big brother asking me to swallow his load of cum cause he’s fine with fucking me but not cumming in me?” I asked him.

He groaned again, “I wouldn’t say I’m fine with fucking you either, but God, this is incredible.”

“Then just let go and enjoy yourself, Jethro. Don’t think of me as your sister. Think of me as a woman or relief,” I told him.

Jethro groaned, “My sister is offering me her body for relief?” he confirmed.

I smiled, “My brother is protesting?” I asked back.

It was a good four or five minutes of still fucking before he said, “Kimmie, if I came in, you would it make me a bad brother?”

I shook my head, “It’s what I want, so it would make you a perfect brother. Please, Jethro, cum in me. Cum in your little sister and stay inside me as we fall asleep.”

I felt him shudder and then felt the sudden warmth as he started to cum. I moaned and pushed my arse back against him, relishing the feeling of him pulsing inside me. “Oh yes, Jethro, cum in my cunt, let me relieve you.”

He came in long slow pulses just like the fucking, and then, when it was done, he kissed the back of my head. “I can’t believe we just did that,” he said. “I’ve fantasised about you for so long.”

I went rigid for a moment and asked, “What?”