Billy was more interested in Joan’s reaction to each move he made than he was in getting a piece of tail at that moment. He found that her hips came up and her belly quivered under him when he started driving into her. At the same time her upper body twisted slightly to the side and her titties rolled against him. As he pulled back she lowered her hips to lengthen his stroke, and when he was back all the way she blew out her breath and sucked in more air which she held until he had gone in and out again.
As Billy started driving down, the arm Joan had across his back tightened and pulled him to her. Her legs tightened around him to make sure he drove his cock all the way in. And as soon as his pelvic bone crashed into hers she loosened her legs and her hips started drooping away from him, starting his cock on its way back out again.
“Oh, my God, Billy. You’re really fucking me. I’m actually getting fucked. Billy, darling, fuck me faster. Make me get it. Make my pussy come.” She tried to increase the pace but Billy held back, trying to make it last as long as he could.
“Don’t rush it, Sis. At this rate I can probably last long enough for you to come two or three times.” He kept plugging away at the same pace, running his cock with its rippled shaft in and out of her cunt and never breaking his rhythm.
“I’m coming! I’m coming, Billy! Is that right? Can you go right on when I come?” Joan’s voice was tight.
“Yes. Come on. Don’t try to hold it back.”
“Oh, my God. Do you feel it?” She was getting louder. “Do you feel my juice?”
“I feel it. It’s all over my balls.” He worked his hands down under her hips. “See? It doesn’t bother me. I’m still screwing you.” He picked up his pace just a little. “I’ll probably come with you next time.”
“I’m still there, Billy! I’m still coming! I never came like this before. What’s wrong?”
“Nothing’s wrong. Have you ever had a real, live cock before?”
“No.”
“Don’t fight it. Let it happen.” He slipped his knees forward just a little and lifted her hips with his hands. When he drove into her with his knees closer and her hips up his balls made a wet noise when they splashed into her wet ass. The sound excited him and he drove harder. Joan’s was the tightest cunt he’d ever been in. It seemed to cling around his cock when he pulled back, like hundreds of little fingers trying to hold his cock in. And when he pushed in, it was like pushing a new hole through warm grease with little fingers gripping but unable to hold on because of the slippery oils.
The thought of what was happening made Billy’s cock get even harder. He rammed it into his sister’s flowing cunt harder and faster, pulling her hips up to meet him with each thrust.
“Oh, my God, Billy, I’m coming again!”
“Me too.”
“Kiss me!”
Billy pulled his head up from her shoulder and his lips met hers, opened and his tongue went between her lips. Her own tongue was moving, circling around his and then snaking out and trying to crawl down his throat.
She got that empty feeling in the pit of her stomach and it radiated out like a slow electric shock all over her body. And when it hit her cunt it erupted in a fast flow of slick cunt juice.