They definitely have pet names for each other
Semi(for Shirabu):
Luv
Lovely
Baby
Babe
Gorgeous
Shirabu(for semi)
Babe
Baby
~~~~~~~~~~~~~~~~~~~~
"Luv! There you are I've been looking for you!" Semi says as he kisses Shirabu cheek
Shirabu blushes
"I've been at the gym baby.."Shirabu mumbles just enough for semi to hear
Semi wraps his around Shirabu waist and put his head on Shirabu shoulder
"Still shy babe?" Semi says
Shirabu hums in response and relaxes into semi touch
~~~~~~~~~~~~~~
Just a tiny bit of fluff
