One day, BF and GF were babysitting some little shit demon kids when BF goes out for a smoke break. He's just about wrapped it up, when somebody taps his shoulder. Jumping back in surprise, BF is tryna be friendly, like "Hey, how's it going?". But the man just stares at him. "I'll make you a deal." He mutters. "We'll fight. If you manage to keep your bones intact, I'll let you g-" Boyfriend interrupts him saying "Hey, whatever the fuck will keep ya off of my back, I'll do it." The man laughs. "Tututut, little man. If you lose, you'll suffer a horrible fate." Boyfriend cackles. "You think I'll lose? You're on!"

And his backstory:

He caused a house fire and killed his parents, his grandma, and his 9 month old sister. He went on a rampage, pouring gasoline in the bushes of people's houses and killing many. He is also interested in bones (and how to break them).

Old (and much more interesting) backstory:

Dennis. A menace to society. He was your average demon child until suddenly one night he went silent. His parents smelled smoke and couldn't find him anywhere, until they looked under the guest room bed. There he was, watching the flame, like it was the second coming of Jesus Christ (sorry if this is offensive to some people, i'm a big dumbass). It burned and burned until they grabbed him, took the lighter, and ran out of the house. He went on to kill many. Hehe.