He's obviously not a ordinary high school student if he doesn't have enough sexual education to know about condoms and how to come up with one by himself. >_>
Obviously the skeletons maids are going to get flesh and look more lively.
It's a pain in the ass to draw skeletons,so artist is going to take the lazy route.
I have no clue how the author will resolve the 60 skeleton girls, in re if he will have them somehow given a semblance of "normal" appearance, or if the MC will just merrily continue with self-delusion due to his pervertedness; given that he will never get laid, the only reason it would matter is whether he could make it possible for them to respond to his tentacle magic or something along those lines (in other words, would it further his perverted desires?)
Saw the smut tag, read a few chapters, lost my patience and skipped to this one and only now MC gave his first kiss, and it was a dumb one.
Good luck for you, folks.