NTR?! Right in my Isekai NTR??!
This is disappointing to me because it makes Hotaru a dumb bitch. She's immortal and this... is the best she came up with?
It also doesn't make much sense regarding her brother. He was the one that wanted to use this kingdom to safely level up without endangering his sister (that can't die), not the other way around. She doesn't need it, she showed she was bored to be locked up here and she didn't enjoy what he did with his power to other players.
So why oh why go to that length to safeguard a position that doesn't serve her, aside from enabling her little brother's overprotectiveness?
Or I guess that's the point. He has issues and she clearly has issues too, happy to fuck ugly bastards to enable her brother's stupid notions.
She could use her gift to fight and train and level up 24/7 and actually protect her brother (currently crying in his bed like a little bitch btw) or even use herself as a training dummy and level up their entire forces but there's less tits potential I suppose