This doesn't answer my question but A is definitely NOT the sort of person for kinky stuff like that. You have a problem with him being with his "brother" who has never seen him as a brother for a long time but threesomes are okay for you apparently. Isn't that what they call misplaced priorities? Well, A doesn't have that in him. If you want something fucked up like that, then you must be reading the wrong manhua.
Lol. I hope it's not this brain you use to cross the road because if it is, you are a walking disaster waiting to happen. You have a problem with A being with his adoptive brother who isn't really his brother but a polyamorous relationship is okay by you, knowing very well that everything about A screams the exact opposite? You really are messed up.
Not you acting like threesomes are extremely morally wrong, and incest is perfectly fine.
And i hate the whole "he isn't actually his brother" argument.
He was literally born into his family, is father (although not biological) has been around since before he was born, he was probably in the delivery room as his bio mom pushed him out.
This man LITERALLY can not remember a time when his mom and dad weren't his mom and dad.
If he never got told that he wasn't actually their biological child this would be a whole other argument. Because he never got treated differently or unlovingly by his parents.
Incest means 2 or more blood related humans having a romantic and/or sexual relationship. So technically it's not incest. Is it immoral? Definitely yes. Since as you mentioned, he grew up having A as his brother. Even tho he knew they're not blood related early on, still it's morally not okay. But this is fictional. And a BL. And most people in this community don't really care about morality a lot of the time. ╮( ̄▽ ̄)╭
Threesomes aren't morally wrong, as you say, but can you engage in it? Not many people can actually do it and in what world or Universe does A seem like someone that can do something like that? You have said a lot but you still haven't explained the reason WHY it has to be so. Just because they are good looking, "Oooh a threesome!" Please, spare me.
Do you realize how emotional A is and how fucked up it would be for him to do something like that? It isn't even in his character.
As I said, if you have a problem with A being with his adopted brother, why are you okay with a threesome with strangers he doesn't even know? If the adoptive brother was oh-so-goodlooking, you people would be the first to ship him with A.
THREESOME