“Did you like licking my cunt, baby brother?” She tilted her head up to look at me. Why did she keep calling me that? It was driving me crackers, forcing me to try to choose between my lust and my conviction. I couldn’t forget for a moment that this was my sister-she wouldn’t let me. And I was beginning to realise that it didn’t matter, because lust was winning-it was kicking conviction’s arse.

“Fuck, Dawn.” I watched her hand on my shaft. Her arse was rising up, her feet swinging behind her. She was beautiful, and I wanted her. God help me, but I wanted her. “You still taste so good in my mouth. I could lick your cunt forever.”

“I might take you up on that.” She grinned. “But first, I think you have an itch you need scratched.” She grazed her fingernails over the head of my cock, tickling the frenulum. I groaned. She moved in, pressing her breasts against my thigh and taking my cock fully into her mouth.

When she came up on me, she pressed herself up with her arms and kissed me for a minute, the words husky and thick in her throat, “I’m going to suck you until you come in my mouth, and I’m going to swallow every last drop. Are you ready?”

“Yes!” I pressed her head down to my lap. “Oh, God, Dawnie, suck me off.”

She settled back down into my lap, nuzzling and nosing my cock, murmuring sweetness around it as she began to suck, holding the skin down tight with her fingers at the base and using just her mouth and throat, up and down the shaft. I knew it wouldn’t take long and so did she, her tongue wrapped around, her hand cupping my balls as she worked, determined.

Her arse rose up in the air and I watched her tits moving as she swayed, reaching my hand out to cup one, pulling at the nipple. She moaned, moving faster, and I liked that, so I squeezed and kneaded her flesh some more. I was trying hard to hold back, wanting it to go on forever, watching my sister’s head bobbing up and down in my lap, seeing her sweet, rounded arse moving like she was fucking some invisible cock back there.