I beg to disagree. Polyamory is so underrated in bl. @Anonymous
Disagree with that. If the plot does not call for it, it won't work. I doubt a shounen-ai with cutesy plot would have polygamous relationships in there. Polygamy is more for smutty or what not BL.
either you go for the older bro or the twincest, choose one. somehow i feel cheated on the older bros behalf if they did both.