Geboku-sama no Iu Toori
So this vampire sees this human guy who smells good. He sucks his blond and in return they have sex. The vampire is the outside strong but tsundere type and he is the bottom. Black guy says he is masochist, he loves that the vampire pushes him away and shouts at him. But really he is kinda sadist because he is the top and in control.. he says he is the slave and vampire the master. Its a bit confusing. Black guy should be sadist and be more in charge because the vampire is the bottom. I dunno why they included another vampire, who wanted to have the human to himself because of his special blood. They would have been two tops so not compatible. But I like how the vampire was a mess from the humans smell.
Ore-sama na Doukyuusei no Kenzoku ni Narimashita