Skelision bro's Questions (3)

I’m trying to find a manga about a girl who has a burnt back and a tattoo that is covering it, I think she got it when her father saves her from a house fire.

So I need help finding some manga,
1:two girls move in together and cook together for fun,school girls,step sisters
2:guy gets kidnapped by girls and it turns out there witches and he is a male witch,bad guys wear gas mask lik some nazi

There was a scene from some manga I forgot about where the character(maybe male) has an interaction and has that"ba-bump" thing and he's like "bubump? What do you mean bubump?" I really want to see it again but forgot from Which manga it's from