It's Pinkie Pie's class, and Smolder and Ocellus share cupcakes with compliments.

Sometimes a cupcake means more than just a sugary treat, but other times, it means "I love you." The two soon end up finding this out, and learn that cupcakes and compliments can be a hobby.

(This story is an entry to The Discovery contest, since most of the fics I was working on probably wouldn't work. Also, this contains Smolcellus, because there aren't enough stories out there that do.)