After i've given up and ask for help, I find it. Thank you for any consideration!
The story may be a one shot or in a collection. I've been through the stories on here and spark and haven't come across it again.
Set during the Christmas season
Sess is Kagome's Boss
Kagome is organizing a carnival of some sort
Someone backs out of the Kissing Booth and Kagome has to fill in, this upsets Sess.
Sess has a last name that Rin has trouble pronouncing, "wagamama" is the mispronunciation (I believe)
Hope someone can help me. Thanks!!