Promt: Wise and Belle would use ANY excuse to fuck. only one bed? (lie) time to share Belle's bedroom, bath too small? (lie) the only way to fit in proper is to stick his dick in, a particularly spicy part of the movie? (it's from their private porno collection) time to relieve some stress
It was all just a coincidence, really, no other reason why these things keep happening. Sometimes, they get too tired to go to their separate bedroom after working such a long day, it only makes sense that'd they crash in only one of the bedrooms. Same with only having one bathtub, they have to save water in this day and age, and that means bathing together. Being savvy business people, they know how to save a few bucks. Of course, it's also not Belle's fault that her big bro's lap is the best seat around. Which is why she happens to sit on it in the bath, on the subway, in the car, on the couch, you name it. It's just a coincidence that there's a hole in her shorts whenever she does it.
Same with their very common porno viewing session, (most of the videos are either of them fucking, or of Wise/both of them fucking their "customers".) They both get so turned on, it only makes sense that they help each other out with that, even if they don't pay too much attention to the video afterwards.
In all honesty, both of the siblings are just real horndogs, and it just helps that both of them are almost always nearby each other, so it just makes sense that they help each other out. It's also the reason why they have camera's all over the inside and outside of their store, so that way they can record any of their impromptu "bonding sessions", which they then pixelate the face, and brands, and then sell it under the table for some extra profit.
Win wins all around