Any idea will do, and I might combine multiple people's ideas into one story.
Please help me out and give me somethin' to work with

Thanks,
RancidInsanity
What if one of them didn't want this? What if both of them want this, but Jim [or whoever doesn't convert] changes his mind? What if neither of them wanted this, and Tammy [or whoever does convert] starts with all her old personality, and gradually strips this away for whatever reason; Jim [or whoever doesn't convert] gradually discovers what's going on, and wants to recover Tammy's [or whoever's] old personality.“I sometimes envy you. Tell me more, how you feel now.“ he said interrested.
“It’s totally different, but I can’t compare it. There must have been a lot of things, but they were wiped out after my reprogramming. Now, I’m just programmed for pleasure and sexual intercourse.”
“Don’t you miss your former life…your interests…your….hobbies”, he asked interested.
“Does not compute” she said slightly robotic.
Jim smiled. When Tammy agreed to become his robotic sexual companion, the scientists told her, that she would keep most aspects of her former human personality. She knew, that she would be converted into a robotic sex toy, and the loved the fact, that the programmers stored five hundred sexual practices on her hard disc.