Dana fetches pizza while Lucy enjoys John

The doorbell rings.

"Ah! Speak of the devil," said Dana, as she skipped off to the front door.

John turned to look at his topless sister disappear around the corner, her breasts bouncing as she rushed to answer the door. Something loosened inside of him.

"Mmmm," said Lucy, humming gently as she suckled on John's member, doing her best to keep it from softening. She cupped his balls and gently caressed them.

"Lucy, that's very nice," John said.

Lucy smiled. "Thanks," she said, letting his member gently fall from her mouth into her hand. She squeezed it lovingly, and slowly licked him from the base of his scrotum up his length.

"Is there something you would like?" John asked.

Lucy smiled again. "Silly," she said. "Isn't it obvious? I want your cock, hard, in my mouth."

"No," John protested. "Not that I'm complaining, but what would you enjoy?"

Lucy looked up to him, gently insistent. "Your cock. Hard. In my mouth."

John glanced up to see Kathy, who was looking on, standing. She was gently but pretty obviously playing with her clit while watching Lucy suck his cock. John could see her nipples poking prominently into her t-shirt. He could feel himself start to harden again, and Lucy hummed in appreciation.

"What do you want, after you've gotten me hard in your mouth?"

Lucy looked up to John with a sort of determination, squeezing him harder as she spoke. "Your cum, in my mouth."

Kathy moaned, and rubbed herself a little faster. John came to realise that Lucy was now rubbing herself as well.

"Is there anything else you want apart from having me cum in your mouth?" John asked.

Lucy panted, stroking John's cock as she spoke again. "You could cum on my face if you'd prefer. Or my tits. Or, maybe you'd like some more pussy," she said, waggling her bottom. "Feeling you get hard in my mouth has definitely kept my juices running, from watching you fuck Jessica."

John was definitely ready to accept that all of his sister's friends were fine with having sex with him, but things still didn't feel like they added up. "Okay Lucy, can you stand up and straddle me?"

Lucy stood up slowly, making sure to let her breasts hang for John's appreciation, and slinked up to him like a cat. "Is that what you want? My pussy?"

John moaned. "Sit on my cock."

Lucy obliged. His cock was only just firm enough for Lucy to guide it in her, but it hardened once more as her sex slid wetly around it. For the second time in ten minutes, John found himself warmly enveloped inside one of his sister's friends. Lucy moaned with contentment.

"This whole situation is sexy as fuck," John said, "but I don't get it. Why are you so keen to get me to come in your mouth or on your face?"

Lucy moaned. "You just said it. Because it's sexy as fuck," she replied, pinching a nipple as she bounced on John's manhood.

"You get off, on the idea of me coming in your mouth or on your face?"

"Nnng, yeah."

Kathy was panting heavily, and gasped.

John looked to her. "And you're getting off on me having sex with your friends. On Lucy sucking my cock, and talking about me cumming on her."

"on you being hard and cumming", Kathy said quietly.

"Oh, fuck yes," Lucy said, shuddering.

"What's that?" John said to Kathy.

"Cum in my pussy," Lucy said. "Use my body."

John couldn't help but be excited, but he knew his limits. "I'm not going to cum for a while," he said.

"Then grab my tits," Lucy shouted. "Let me know that you like me for my body. That you want to use me to get off," she cried.

John grabbed both of Lucy's breasts, and mashed them into her chest. He gently pinched each nipple between two fingers, and felt Lucy melt wetly over his abdomen as she cried out. She slowed her bouncing, and then gently slumped against him, her breasts pushing against his belly.

After half a minute of her lying softly but heavily on him, Lucy let out a low chuckle. "That was goood," she said, lifting herself up. "I was ready for that. Shame you couldn't come yet though, John," she said, caressing her breasts for his benefit. She shuddered. "I want you to promise me that you're going to splash me with your cum some day soon. Any time at all," she said, bouncing slowly on his cock again.