I don't know. Concept overall feels off. Not the BL portion even, but overall. Can't put my finger on why exactly, but perhaps, it feels more like a premise to actual BL development, rather than a thought-out concept. I mean Seikon No Quwaser (or something like that) had tit-sucking as its core, but it was even logically explained there. Here - no explanation whatsoever. Not even a question of how things work, really. Shallow.
