Basically, they had an argument and the way they solved it was sex, to try get the blond haired girl to calm down and listen to her. Morally quite questionable but this is quite literally my favourite series ever. I wouldn't say its outright SA but ofcourse everyone's different. I'd say still give it a go because there's a lot of emotional depth and it overall extremely fluffy and cute imo!!
Spoiler
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Charlotte is trying to make Skadi hate her so that the break up will be less painful for Skadi because she’s scared of the consequences of staying together due to the mother. Skadi then goes after Charlotte to stay by her side, like glue. So yeah they had “reasons” and the story ends sweetly. But I skipper that part cuz I can’t handle that shi

I honestly wanted to drop it. :D