World: Highschool DXD

Plot: A "normal" family that moves into Kouho stumbles upon a familar giving out flyers. The oldest brother of the family being curious summoned a devil, and goes on from there. But why isn't the family the least bit surprised about the supernatural. Why does the older brother seem more interested in the biology of supernatural creatures than magic. Why is the youngest brother physically stronger than any evil piece rook in existence. Why can the dad's eyes kill others with a glare. Why is the mom so damn nice to everyone and everything? And why in all that's unholy do they all have powers?!

Main MC: older brother

Side MC's: the rest of the family

Harem: of course it's highschool dxd.

Eldest brother powers: Biology manipulation of the highest level(able to manipulate anybody human or other wise), telekinesis on the highest level(able to control everything)

P.S these are powers not sacred gears, they don't have any unless you want them too.

Youngest brother powers: Physical improvement( able to improve physical stats immensely with a short period)

Mom's power: The compassion ring from DC comics, but without the ring.

Dad's power: Able to warp reality to a certain extent. (Aka can't say a die to Ophis and expect it to die that second. It'd take at least one thousand times of saying die to do that. Also he can't actually create things but simply warp what's already there.)