"My futa roommate is a prostitute!?"

"You've known Mimi ever since high school, she had been a bit shy and nerdy, a gangly girl always hiding in long skirts an oversized sweaters, but a real sweetheart when you got to know her and totally tame for a futa. You stayed in touch all through college but only via email and phone calls since she didn't really care for social media, and when graduation came Mimi happened to be looking for a roommate! You thought it would be great...until you met in person. It seemed Mimi was a bit of a late bloomer, in fact you weren't even sure if this was the same girl you went to school with. Gone was the frizzy hair and massive sweaters, now the futa was a damn glamazon! Her already tall frame had filled out with outlandish hourglass curves, she had finally found a conditioner that helped tame her frizzy locks into an absolute lions mane, and her emerald green hues were finally visible now that she had ditched the thick frames and gotten laser eye surgery, she was even spotting a few cute little tattoos! To say nothing about how she dressed, you owned belts wider then some of her skirts it would seem! And as if she wasn't tall enough she seemed to absolutely adore platform heels and boots, which also meant her massive, barely concealed, futa package was a little closer to eye level then you might like. The house the 2 of you rented was amazing, a restored Victorian with all the modern touches while still retaining much of the classic appeal, though the rent was a bit steep. When asked about her job Mimi always kept things vague, simply saying she worked nights and handled customer relations, and that on rare occasions she may need to have clients come over but would keep things contained to her office. While it was...odd to see the occasional nervous woman come to the door at all hours of the night, Mimi was as good as her word and kept things contained. That is until a certain incident. While you didn't witness the whole altercation, it seemed to involve a client owing Mimi money and things got rather physical. It ended with Mimi throwing the woman down a flight of stairs. It was at that point a roommate meeting had to be held, and Mimi confessed, she was a sex worker."

So this whole idea revolves around YC discovering her roommate MC is a prostitute. The plot is basically finding out how to deal with this, and possibly even purchasing her services for yourself.