My boyfriend's a vampire!?!?

Hiro is a unique child.
After all the trauma he had to face, he still kept his childish and happy nature.
He's really smart when it comes to academics but he's dumb with everything.
Always excited to try new things and go new places.
He transferred back to the Saitama district after 5 years in America.

Kira(real name Kirai) is a royal blood vampire.
He was too strong so he was always put down.
He is shy to everyone but when he feast, he's a beast.
Now has a crush on Hiro.
But there's one teeny problem.
Hiro is a human and has no idea he is a vampire.

Now the two get together and form a bond, that might be more than friendship.
But will he bond break when Hiro learns the truth?
Vampires live forever but not humans.
"Maybe you can-"
"NO! Maybe we can find a way to make you age the same way as me, which is never, but not into my kind"