so this is shouunen ai right???

For now it's only just a smidgen. It could also just be placed there for fanservice.

I don't know.

We got cannon gay love. But so far it's unrequited. So it's a bit more than just fanservice.

Personally, I think Pigsy does love big brother and vice versa it's just shit keeps happening. Look at how jealous Pigsy gets when big brother is around blondie the stalker.