MADK!!!! Can't do mutual crazy obsession better than Makoto and J.
WARNING: gore, vore, rape
https://www.mangago.me/read-manga/madk/
I felt like this one was paced a little fast, but you might also enjoy this one.
https://www.mangago.me/read-manga/release_your_persona/
---- Edit: sorry this one has mpreg ----
If you want unique and weird, you a......
