Recs where the seme is down bad for his uke and the uke is down bad for his seme.... Just ...

have you read this?

https://www.mangago.me/read-manga/in_the_deep_1/
they both kill for each other on a massive scale & they are both good to each other. the art grows on you.

or maybe this https://www.mangago.me/read-manga/the_eternal_circumstances/
their mutual obsession runs deep

recommending https://www.mangago.me/read-manga/in_the_deep_1/ is diabolical cause that manhwa was not joyous or full of love. it was just a lustful relationship between stepbrothers