Disclaimer: I own nothing.
This is purely crack. It has no plot whatsoever.
"Ugh, Reborn, this is all your fault. I am never letting you get near me ever again!"
"Now why would you say that, Dame-Tsuna?"
"Did you not hear me? If you ever get near me again I will freaking ca-ca-castrate you, you s-sa-sadist!
The doctors in the room winced. Castration? Just because of triplets? Okay, she was only twenty...
"Wh-what the hell are you doing over there, d-doc? I c-can't see you over my stom-ACH! Oh, get these little monsters out of me!"
"Man up, Dame-Tsuna."
"If I was a man, do you think that I'd be having this problem?"
"Stop whining."
"How did you even convince me to have sex with y-YOU!"
"I'm sexy."
"Damn straight. AGH! I wish I had never married you."
"Come on, Dame-Tsuna. It's time to deliver. Do it with your dying will!"
"WAIT, R-REBORN!"
The doctors watched in fascinated horror as the bullet entered her skull. She fell limp onto the bed. They turned to stare at the man. "Wait for it. In three, two, one..." He counted down on his fingers. A flame appeared on the girl's forehead. The doctors started when her head shot up, her eyes glowing orange.
"REBORN! DELIVER MY BABIES WITH MY DYING WILL!"
And that is the story of how Sawada Tsunako broke the record for fastest delivered babies in the history of the world. And how Reborn helped. Sort of.