Literally she's the one who moved into a share house with adults around. He only treated her like his kid sister because he felt bad about her childhood. If you've been following then I'm sure you know he didn't do anything considered "grooming" or whatever you wanna call it. He just messed around with her as anyone would do with their younger sibling. I think they had a pretty good relationship but girls being girls she had to go and fall in love he can't do anything about that they literally live together =_= also you can't judge the story just yet you don't know how he'll respond or if there will be a timeskip so don't let your imagination run wild folks (▰˘◡˘▰)
Literally she's the one who moved into a share house with adults around. He only treated her like his kid sister because he felt bad about her childhood. If you've been following then I'm sure you know he didn't do anything considered "grooming" or whatever you wanna call it. He just messed around with her as anyone would do with their younger sibling. I think they had a pretty good relationship but girls being girls she had to go and fall in love he can't do anything about that they literally live together =_= also you can't judge the story just yet you don't know how he'll respond or if there will be a timeskip so don't let your imagination run wild folks (▰˘◡˘▰)