Rin Okumura x Male Reader

"Hey, kid." A man said.
The young child remained silent as he gazed at his former home. It didn't look like a home actually, it was more like ruins. Then the man placed a hand on the child's shoulder.
"I know this may be hard for you but-"
"It's my fault..." The boy said as he looked at the man's dragon tattoo and the two katana that were strapped to his back, "If only I weren't born then maybe-"
"Hey, I didn't risk my life to save you for nothing, now did I?" The man chuckled, confusing the child.
"Why would you, an exorcist, want to save me?" The child asked in disbelief.
"My gut told me to." He laughed.
"Your gut?"
"Yep." He smiled, "Since I saved your life, you're gonna have to listen to everything I tell you, for your safety. Deal?" The priest held out his hand to the hesitant boy.
"Deal." The boy took the priest's hand.
"I'm Isamu Hayakawa, but the others just call me 'Blade Dancer'."
"Blade what? 'Gramps' suits you better."
"W-WHAT?!!"

--- Years Later... ---
"OI!! TAKESHI!!" A loud roar was heard from outside of the shrine
"That's not my name, you know that..." He said lazily.
"GO GET SOME FOOD!!" The man said as he and two others tried to catch a small but mischievous demon.
"Fine..."