Reprogram them

Wiping off your dick on Cho's porcelain butt, you make up your mind how to change the doctors. They're both incredibly hot already, so few changes are needed in that department.

"Neither of you will grow hair anywhere other than your head and internal tracts. Chae, your perky little tits will grow by one cup size, and your pussy will always be as tight as a virgin's. Cho, your hair will grow to waist length within a day, and your body will become more of an hourglass shape. Both of you will gain pleasure and be able to heal from any injuries incurred during sex, and be immune to all sexually transmitted diseases. You will keep your bodies fit, healthy, supple, and all-round delectable at all times."

Not much you haven't done before there, but you do have a couple of different ideas for their behaviour.

"Chae, since you enjoyed what I presume is your first time cheating so much, you are now obsessed with cheating on your husband, and are **** to have sex with anyone, male or female, at any chance you get. You will become the biggest slut in this place, but still do everything you can to hide it. Cho, clearly your sister has changed your mind about a certain taboo. In fact, she's given you an **** fetish, and if you don't have sex with her at least one a day you'll start experiencing withdrawal symptoms. Of course, you'll both be ready and willing for sex whenever I ask. Any unusual behaviour around me, or changes to people you would previously consider strange, you will accept without question. You will return to this deep hypnotic state whenever I tell you to 'freeze'. Now, unfreeze."

Both young women orgasm loudly, four breasts rubbing together wildly as the sisters shudder into one another's arms. Somehow, despite their knees trembling they manage to stay standing, and finish their moaning with wide, satisfied smiles. Cho has eyes only for her sibling, kissing her gratefully on the cheek, whilst Dr Chae looks to you.

"Thank you so much, {if Futa==true}Mikaela{else}Michael{endif}," giggles the Korean. "I can confirm that you're in excellent shape, and do indeed have some rather extraordinary capabilities. You're definitely qualified to stick around at SPERM."

"I assume you don't need to share my results with anyone else, then?" you ask with a grin.

"Oh, of course not!" The doctor disentangles herself from her lover, and walks over to the computer, where she promptly replaces the open-access data on the system with a harmless decoy. Her sister, pouting at the loss, follows her over, reaching around Chae with both hands to rub her naked little breasts, which are already beginning to swell.

"There, all gone," beams Chae, accepting Cho's ministrations as if they've done it their whole lives.

"Great," you nod. "Could you analyse the chemicals I produce? And assess the limits of my abilities? Keeping this just between us, of course."

"Naturally - I'll keep it all on my personal hard drive, and I'll fake your results for the database, in case anyone goes looking." Cho slips in front of her sister and eagerly starts licking her nipples, her hand alternating between rubbing each of their pussies.

"Should I be going then?" you suggest, not wanting to be delayed too much - lesbian **** is hard to resist, and you've got places to be...

"Turn left out the doorway and follow the hall to the end, and Jemma should be waiting for you there." The naked doctor points the way with professional curtesy. "Oh, and {if Futa==true}Mikaela{else}Michael{endif} - why don't we keep this our little secret? I think you could use another checkup tomorrow..."

"It's a deal," you nod, then leave the sisters to their lovemaking.