Shalala

I can't recall well but it's about something that it's happening on an island.
They are having sex until they die (humans) with devil guys or something like that.
When they are trapped in this island, they have wings and they are becoming angels.

I know it's quite weird as story.

They can escape (humans) of this island but if they are trapped they couldn't and they have sex with those gargoyles or whatever.
It's a yaoi and I can't find this, I'm searching it everywhere but it's impossible