Miko came by one day to you holding something in her hands, she said it was called “Lip…stick” and humans use it to kiss their love ones and leave their marks, so you definitely wanted to see how Ratchet would react, So while Optmuis, Acree and Bumblebee were out on a mission, Bulkhead went to pick up the kids Jack, Miko and Raf from school you walked over to the command area where Ratchet was working on something

Y/N: Hey Ratchet

When Ratchet turned around you have him a kiss on the mouth, two on his cheek and one on his chassis which you backed up and he was too stunned to talk

Y/n: Why so bitter ratchet?