Bite Me Black & Blue

AU where Dazai finds a loophole. He uses Bram to bite Odasaku before Odasaku can die. Now Dazai has to deal with the consequences of what he's done. But if it was to save the one most dear in his heart, does he even care to regret it? No. But there is a catch. Odasaku can never drink Dazai's blood specifically for Brams ability will cease working and Odasaku will die.