“It does taste good,” Kelly agreed, scooping a glob off her face and into her mouth. Justin looked over just in time to see Liz wiping the cum off her tit, and then she brought it to her mouth. He watched in awe as his sister brought her finger with his cum on it into her mouth. She closed her eyes, and smiled, and then saw him watching as she opened them, and turned a bright red.
“I should get back to taking notes,” Liz said, turning away from him and going back to the chair in the corner. She sat back down, still naked. Justin could see her huge tits rising and falling as she breathed heavy. Becky was still struggling to take more of his cock down her throat. She finally gave up, and climbed on top of him. Her pussy felt looser than the others, but that meant she could go faster. She started riding him hard. She rode him until she had her own orgasm. When she got off him, Justin looked around to see what he should do next.
Kelly looked satisfied for the moment, and then Cassie laid down on her stomach. A second later Lindsey lay down on top of her. They lay on top of each other, waiting for Justin. He quickly got up behind them. He shoved into Cassie first. He fucked her for a while, and then pulled out and shoved into Lindsey. She was taking him better than before, but still not as easily as the others. Justin took turns fucking them both, moving from one to the other easily. Once they had both cum in that crazy position, Justin fell back onto the bed.
The second he was down Kelly had her mouth on his cock. She began to slobber all over it, and then he felt a mouth on his balls. Lindsey and Cassie joined them, and then he had two mouths on his cock and one on his balls. It felt unreal. He had never even imagined what something like that might feel like.
And then Justin felt something touch his asshole. He tried to squirm away, but the girls wouldn’t let him. The fourth mouth began to lick his asshole, while the others worked his cock and balls. It was too much. Way too much. Justin didn’t even have time to warn them. He began shooting a big thick load into Kelly’s mouth. She took it for a moment, and then pulled back, cum spilling down her chin and onto her tits. Justin shot ropes into the air again, and again it rained down on the girls. They all cheered again as he shot a huge load all over the place.
“Wow, that was really hot,” Lindsey said.
“Can we keep going?” Kelly asked hopefully. Justin knew he could probably keep going with the girls, but he was afraid that the next round would have him taking more than a tongue in his ass. Doing it with all four of them was insanely fun, but it was too wild. It had already gotten out of control. And he knew he could likely have any or all of these girls any time he wanted now.
“Uh, I think I’m done,” Justin said, and they all let out noises of disappointment.
“Ok, you did good you big stud,” Cassie said, and kissed him on the cheek.
“Ya, your pills work really well,” Becky nodded.
“Oh ya, we’re supposed to be doing trials or something,” Lindsey giggled. “Liz, how did the note taking go?”
“Good,” Liz said in a high breathy voice that Justin didn’t recognize at all. “As far as I can tell, Kelly had two orgasms while Justin fucked her, and one more while she sat on his face. And Becky had two while he fucked her, and one more with Lindsey. Cassie had three from having her pussy eaten, I think, and then one more when Justin tower fucked you two. Lindsey, you had three with Justin and one with me, right?” Lindsey nodded. “And then I had two,” Liz added, blushing a deep red and not looking at Justin.
“I only made you cum once,” Becky said.
“Ya,” Liz said, “I came once just from watching. It was all really hot.”
“Wow, you dirty slut, you came just from watching your brother have an orgy with your friends,” Kelly laughed, and everyone joined in while Liz just blushed.
“Ok then, now what,” Becky asked, and everyone looked at Justin.
“Uh, well, I guess we found out that the horny girl pills work,” they all nodded. “And that the one time male endurance pill does enhance the long term effects, I think. So, uh, now we just need to keep running trials. You should all try them each out individually, and then we can start to mix and match more once we have better results. And I suppose we should start trying out the long term female pills too.”
“I want the long term orgasm pill,” Kelly said. “I want all sex to feel like that.”
“Can I do the long term big tit one,” Lindsey asked, blushing slightly.
“I’ll keep trying the big load pill on more guys,” Becky said with a big grin.
“Cassie, Liz,” Justin turned to them, “any requests?”
“I’ll take more of the big dick ones to try out on different guys,” Liz said, still unable to meet her brother’s eye.
“I’ll try out more of the one time ones,” Cassie said. “I still want to see what the short term big dick one does.”
“It doesn’t do what the long term one does,” Kelly said. “I used it on Trevor. He grew maybe an inch or a little more, but not like Justin.”
“Ok, everyone make sure to keep monitoring everything as closely as you can,” Justin said seriously, and they all nodded. “I know this is a lot of fun, which is the whole point, but we are running serious trials here. If this all works the way I want it to, these pills will be worth a literal fortune. So take it seriously. If one of the pills doesn’t work the way I said it would, you need to let me know. Or if it works too well, or anything. We all need to be extremely diligent about this, so we can all get filthy rich.”
“You’re going to be a fucking legend, Justin,” Cassie said, looking at him with clear admiration.
“Literally, a fucking legend,” Kelly added, and they all laughed.
“I hope so,” Justin smiled. “But we still have a lot of work to do.”
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