Make her more sensitive.

“I don’t know, I love her smaller pert little tits,” he sucked on a nipple again. “I wish she were more sensitive, though; I wish she could cum just from a guy pushing his cock into her or someone sucking on her nipples.”

Julie and I both moaned at the thought before my father gave me a light slap on the arse. “Up,” he said. With some ****, I stood up, groaning as my father’s thick cock slid out of my cunt. “That is doable,” he said as he stood up.

He left the room without saying a word, and I stepped up behind Julie and reached around, squeezing her tits. “Are you really going to try and knock Julie up, Mark?”

He laughed, “Every chance I get,” he replied. “I can’t believe you both signed those contracts. I still love you Kimmie, but now I also own you.”

I moaned as Dad got back with a syringe. “This is a **** that will make Julie much more sensitive to almost everything. We sometimes use it at parties, make one of our toys extra sensitive and have people play with them for hours until they are barely conscious from orgasms.”

Julie moaned and smiled, “Too bad I haven’t signed a full contract yet,” she said confidently.

Dad laughed and jabbed her arm, “Too bad the agreement was no fertility treatments or surgical modifications.”

“Ow,” Julie said, “you just injected me with that crap.” Dad nodded, “I can’t believe you. Oh, Fuck,” Julie shuddered on Mark’s cock.

“Yeah, it only takes a few seconds to start working, but it gets a lot more intense,” he smiled. “Now Kimmie, I’m going to pour myself some wine; try and break Julie, will you.”

Mark was groaning as Julie shook on top of him. “Damn, she’s having a big orgasm,” he said as I pinched her nipples and she squealed in pleasure.

She was no longer moving on top of Mark, just sitting there rigidly as a plank of wood, but I could feel her skin shivering under my touch and hear her squirting cunt. “Wow, that looks like fun.” Her orgasm continued to carry through her as she made unintelligible noises, barely breathing.

“God, she’s so hot inside,” Mark said. “Fuck, I’m cumming.” As he started to pulse within, my best friend Julie went even more stiff. Now, only tiny squeaks escaped her mouth as she rode through her orgasm.

As Dad returned to the room, he said, “You should probably pull out Mark before she blacks out from lack of air.” He seemed to take it very nonchalantly, as if a woman passing out from lack of air due to orgasm was an everyday event.

With some difficulty, Mark pushed her off him onto the couch and stood up. “Holy shit, that’s hot,” he said as he looked down at Julie, who had brought her hand to her cunt and tits and was busy rubbing her clit and nipples, panting and moaning in pleasure.

“Yeah, the **** will take about two hours to wear off; she’ll probably want to be pleased the whole time. Kimmie, be a dear and clean her up for me; I want to see how she responds when I push my cock into her sensitive cunt.” Obediently I dove into my friend’s cunt and she almost immediately came in my face, I lapped up Mark and Julie’s combined juices as Dad said. “Maybe doggy style, and you can fuck her face, while Kimmie is under her sucking on her tits, let’s see how much she can take.”

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