I'm guessing the end of the story will be similar to "1 litre of tears". Dying slowly whilst experiencing a full love by the one. Ugh! My heart better be ready.
If only Reo were a nicer guy, they would have had a casual threesome. Everyone is happy. The two MCs got a dominant top to dick them without any struggle.
If I were the MC, I would make sure he won't get any sleep until the project is finished. After that one side accusation, say good bye to your sleep time!
BL world to MC: You're the chosen one! It's said that you would join the BL, not destroy them!
MC: I hate you!