Sarah and Jason argue a little on the way to the test lab if they will test the excercise or sexual stimulus. After a long argument, Sarah wins simply by saying that she has more 'data' to study.
Jason concedes, he knows that he can't really beat her on those arguments.
Rolland and Joan agree, and upon arriving at the test lab, they start querrying some questions about the experiences they tried, and Sarah recounts the experience of the other night, including the part about sucking Jason's cock.
"YOU DID WHAT?" Shouted Jason, first learning about that.
"Sorry big J, I just got carried away testing my abilities, when I found out I could control your cock, one thing led to the other, and a girl has her needs." Sarah says, in a faux apology.
"Wait, so that is why you knew how to control my cock. Fucking hell Sarah." Replied Jason, pouting over Sarah getting too comphortable with his body.
"Wait, you can control Jason's penis?" Asked Dr. Joan, with an extremely curious tone.
"Well, yeah, I found out that a lot of my muscles and some nerv ends ended up on his cock, so I just ended training how to control it, it isn't that hard once you know the process." Said Sarah, freely gesticulating using the cock as a hand, much to Jason's shame.
"Marvelous, if we can replicate this effect somehow, it will unlock a whole new field of research for us Rolland, we would revolutionise the world, transhumanism beyond our wildest dreams." Said Joan, now daydreaming about all of the possibilities she could think of.
"Marvelous indeed, we need to make note of that for sure." Said Rolland, adjusting his glasses to properly see how easily Sarah could control her new appendage.
"OK, so we had Anal intercourse, Nipple stimulus, Self Felatio/Anal and Masturbation. Is that right Sarah?" Asked Joan, taking notes of the tests.
"Yeah, pretty much doc. I'm curious if putting something other than a penis in me could have a different effect." Said Sarah, wondering if she could get some toy from it.
"Oh, I have something in my room." Said Joan, running out of the room, only to return in a few minutes with something under her coat.
"Well, don't tell everybody I've gotten this, but here is it." Joan says, as she opens her coat, to show a horsecock dildo.
"Hahaha Joan, if I hadn't known you from college, I would be surprised." Said Rolland, in a hearty laugh.
"Well, we can start now." Said Joan, with her cheecks rosy.
They connect the reading equipment into Jason's and Sarah's body, and turn on the readers, leaving the 2 on the test chamber.
"Well, any time you want now!" Said Rolland through the speaker, doing an encouraging grin and a thumb's up.
Jason lays on the test bed, and gives Sarah the horsedildo, feeling kind of ashamed of doing it again. Using her appendage cock, she is able to insert the horsedildo on her mouth, and starts sucking and manipulating it with the help of her cock. Jason can already feel the heat comming, feeling the endless waves of pleasure as Sarah slobs all over the horsedildo, with both letting some loud moans escape. After climaxing, Sarah removes the dildo and tries to survey the changes with Jason's help.
The nipples got puffier, breasts are now very noticeable, skin is even softer than before, alongside Jason's facial features becoming way more round. Jason pays a lot of attention to how sensitive his nipples have become.
Sarah takes this as a cue and starts coaching him, where Jason starts playing with his breasts, his body shivering with every wave of pleasure, his cock twitches, Sarah tries to help him, and moves it upwards, fiting it in between Jason's breasts, as his 15 inches turned 18 inches when at max hardness and length. Combining both stimulus, they could feel Jason's breasts growing in real time, his hair getting longe too, now finally big enough to reach his ear, and his muscles looking way more well defined, as Sarah's flesh coalesces around his muscles.
As they finish it, Jason get some of it on his mouth, but he doesn't even seen to care at this point. Just going with the flow, Jason lays back on the table again, almost powerless, and let Sarah finish the session in style. Sarah takes the cue and puts her cock on her Mouth, having the experience of hearing Jason's moans getting loud for the time. His voice started getting higher, become a very feminine version of his regular voice, almost similar to her's, and each scream led her to become more and more excited. Jason couldn't hold back and started playing with his breasts again, now reaching DD cups by this point, almost going nuts from the constant pleasure and stimulus.
His hair now finally covering his face, and Sarah's control reaching a new height, she moves Jason's legs, shaking them around as she climaxes again, on her own mouth, only releasing her cock when she finally swallows every last drop of cum.
The two, completely spent at this point, feel Jason's muscle growing again. Now Jason and Sarah look like a proper big dicked amazon, with the body build to show.
The two doctors give them the time to rest as they examine the data collected.
After an hour, Jason and Sarah both wake up, climbing out of the table and exiting the test chamber. As they leave, they see that Jason's way of walking is very different from before, with Rolland guessing that it is probably some muscle memory being transfered from Sarah to Jason.
After thanking the two for giving them such precious data, Dr. Rolland and Dr. Joan give them their room numbers so they can call them if they need anything. The two leave the test room and direct them about the way back to their bedroom.
On the way, while Jason and Sarah are alone in the elevator, Jason has a silent moment with Sarah, and decides to break it: "Hey Sarah!"
"What?" Asked her.
"Turn out that you are right. I think I should be trying to make the most of this whole thing. I don't think I would have tried any of that by myself." Said Jason, in a very earnest tone.
"Well, you know, I just like to live the moment. I figured that you needed to open your mind for more possibilities. And maybe me too." Said Sarah, introspecting about everything.
"Thanks, I will." Said Jason, as the elevator finally reached their floor, and they both moved into the bedroom.