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Why no tho??? It would be a great bond. Besides is not gonna be a the happiest ending either way, somebody is going to be REALLY hurt. And I am in Ohn side all the way no matter his decision. I love Seo but I know is going be his fault if ohn ends of with jae, and jae is being a really bad brother right now for taking his brother crush while pretending to help him. So, my final opinion is on single or with a poly relationship.
.......... two of them are siblings ? sounds a bit incesty to me
Oh wait, right, you're a shounen ai reader. You don't handle Yaoi like that. Sorry it's my mistake. I have already stuff with incesty included, however the siblings are NEVER attracted to each other but the third person in front of them. But let's stop, positive vibes only~~
Your reply … (≧∀≦)
I think, to make this end well..... a threesome.