[m]Looking for a manga that is not yurri yaoi shounen ai or that other one i can not remember the name of. I'm looking for a sienen manga where two main characters are boys(bc girls are useless.) who don't get along who have a supernatural slave/pet master relationship-but that is only one part of the relationship. Like maybe they totally hate or distrust each other. Sounds bad but would be interesting to read, no?

I read
07 ghost
Servamp
Hikaru no go 😁 😛 🤣 🙄 😮

i'll list some mangas with male MCs regardless the genre (bcoz, actually 07 ghost is not seinen, but josei)

their genres are mixed between josei,shonen,seinen or maybe shoujo.
and this list are not restricted with boys (as long the MCs are males and there's two persons)
😁

1001
Amatsuki
Are You Alice?
Zetsuen no Tempest --------- this manga is closest to your description
Chronos - Deep
Dogs: Bullets & Carnage ---------- and this is too~
Hell's Kitchen
K - Memory of Red
Kesshou Monogatari
Makai Ishi Mephisto
Ludwig Kakumei ----- great shoujo manga with twisted story
Ouroboros
Shinigami Doggy
Sougiya Riddle
No. 6
12 Nin no Yasashii Koroshiya - Leo Murder Case
Seishun Kouryakuhon ------- actually, the MCs are four persons

Julius Visconti is still the best captain.

[img]http://i.imgur.com/vUC343X.jpg[/img]