lovesick dog both freaky (mentally deranged) in their own way
Litc (both are toxic because of their traumas)
Checkmate (both are obsessed and possessive of each other)
Eighteen's bed (they have the same shitty personality)
Assorted wildness (both are freaky and obsessed with one another)
Shame application (horniest couple alive ong/they fuck everywhere and anywhere)
Secret therapy (also one of the horniest couple alive)
https://www.mangago.zone/read-manga/mobius_strip/
This one probably fits too:
https://www.mangago.zone/read-manga/goodbye_harlequin/
recoz pls, a manhwa where both characters are toxic or weird like they on the same freakquency