Responses
If your asking for nasty smut in general just read anything by ppatta
But as for people who outfreak eachother
- love in hell ( highly recommend since it's very close to what u asked for )
- actor and pervert
- snake hole ( has nasty smut too , there isn't much outfreaking eachother though , but the smut is nasty as hell )

Rec for yaoi where freaks outfreak each other ლ(´ڡ`ლ)