This a fan art about two characters from the manga "Seimaden" by You Higuri.
For those who do not know about the story:
Teteiyus (the one looking like and Angel who is really a demon) pretended he was in love with Zardei (aka "Fangboy") so he could better betray him later. Zardei, who was violent as well as hot blooded, upon discovering his treason, tored one of his wings in a fit of rage, thus killing him (from shock? or bloodloss? ^_^)
Zardei, feeling regretfull about having killed the only demon he loved, made a pact with another demon so he could revive Teteiyus...
I'm not gifted for telling stories, but I like to try nonetheless ^_^