When I read omakes that riff off of chapters I read a while back, I end up laughing super hard but I can't properly remember why exactly why it's so funny...
These gags really stick with you on a subconscious level huh. This manga is fantastic.
Thanks as always for your guys translations!
Cum means "Combined with", and is used to describe things with a dual nature or function.
e.g.: "a study-cum-bedroom"
So basically means that for Nozaki, Sakura is both a friend and an assistant at the same time.
lol maybe waka should buy some separate screenstone sticker packs for seo to play with, i can totally imagine her bothering her older brother with them