It was established very early that these two were not closely related.
And they're silly and strange but they're perfectly harmless, with no ill-will towards others, feeling admiration for some, and with adoration each of the other. It's best when they're happy.
I can see how people would think theyre twins but cmon it was stated several times theyre just friends lol, did the beginning chapters full of tits and ecchi keep you guys from reading lol ?