Rivals to lovers. Uke wakes up in a parallel world in the middle of having sex with his rival. Seme tells him they are a couple in this world - uke returns later. Real hot shit. (There are some side stories but nothing special)
You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.
I'm Banging My Rival From A Parallel World!?