WOW, so I reread this and I loved the two enemies becoming lovers after the uke accidentally traveled to a parallel world where he and his rival were lovers! Comes back and finds out the seme DOES love him and likes to tease him, and they start dating! Multiple more stories too, but I didn’t really like the bodyguard one (bara), but the mask one was nice, short and simple.
I'm Banging My Rival From A Parallel World!?