
Aka not blood related, isn't incest, and while not cause any physical damage if they were to have sexual intercourse, they're children while also be perfectly fine( which is probably the main reason incest is taboo because the kids turn out fucked up) with all these reasons i honestly don't get why you're mad about them becoming a couple.

There wouldn't be the word incest in pseudoincest if it wasn't incest. Do you get my reasoning now? It's just as Anneka-senpai said. I need not explain more. If that's what you feel, then go, root for them I don't care. I don't need to justify our actions because we have different opinions. I can respect your decision, can you just respect mine?
It's similar to Beware of the Brothers; and in a way- but not exactly- also similar to I Belong to House C-something (I dropped it cause I didn't like the ML :3)

Yesssss, I totally understand because I'm a bit similar in that regard. Like, when I have a friend who's a boy, that's all he'll ever be for me lol. I have a clear distinctive boundary for friendship and romance. XD! Mine's not even blood-related in the least. (=・ω・=).
And sure, let's be friends! ε=ε=(ノ≧∇≦)ノ
it would be so weird if they date- cause doesnt dietri think of her as a sister rn? and he tells everyone like “this is my sister” and- WOULDNT IT BE FUCKING WEIRD???