This is a great example of a female held captive as a sex slave in a closed off room. It's great up to the point where the scat is all up against the porous wall and the urine must be flowing all over; it must reek in a closed-off room and it cannot share the same air conditioning/heating air with the rest of the building or else the reek will be everywhere. I just wish that authors would put more effort into making the scenarios more plausible when scat appears. Otherwise, it is like the doujin just took a "guillotine chop" to its plot.