I don't think you understand what NTR is. There will never be any of that in Harem Hotel. Your harem fooling around with each other is not NTR.
You can expect more of this. I and many others enjoy woman on woman stuff. And I don't think it would be a proper harem if the women didn't fool around with each other.
Your point being Lin wants to, so it's not rape, so it's not netorare.
This could be argued about, given her behavior and the fact she is nothing but a slave according to the lore, but you being the one who choose what she wants i guess you know better.
While i jack off to lesbian porn every now and then too i wished it could have been avoided in your game. I gave my opinion, you took notice of it and that's about it.
I still consider you did a great job regarding the character.
(Now if i was the manager of the hotel Maria would be kindly asked to leave cause i just don't click with her... Good thing i'm not i guess)
And again, i consider you do a great job. I was actually surprised to not have my word to say at this specific point, given that i was given the possibility to tell her to back off previously.
I consider your work even more impressive now that i know you work alone. So yeah, congratulations, you're doing great.