You know come to think of it, I don't think Fuwamoco sharing a bunk bed is that weird. They are identitcal twins after all and I've heard many stories of twins being very close. Identical twins are literally clones of each other after all. Twins often have their own language and there have been stories of them being able to communicate telepathically or know when something happens to the other. Then there are those stories of twins who marry similar people or are separated at birth but end up marrying people with the same name, naming their dog the same thing, and even their children etc. So all in all it's not weird that they share a bunk bed.

What WOULD be weird is if there were a set of non twin sisters that shared a bunk bed. Like imagine if there were sisters that had an age gap of a few years and were different people genetically but still lived together and slept in a bunk bed every night. Like imagine if one sister moved and the other sister insisted on coming with her, and it was suggested they live in apts next to each other but the older sister threw and tantrum and demanded to be in the same apt. Imagine if also they both talked to stuffed animals regardless of whether or not there were other people in the room. That would be weird.