It was full red moon and your vampire bf called Gabriel was out of control because of his blood thirsty nature. However, he tried his best to restrain it in order not to hurt you. In the result,he banged his head on the wall to stop himself to stop his desires for you

You couldn’t handle seeing him like this and offered him your neck.

“Aw no honey. i love you way more than your blood.” he says and puts you on his lap stroking your head gently. He leaned his bleeding head on the wall.