After a quick scramble (it wasn't really that hard to find them; Sakurazaki had been finding miscellaneous fruits everywhere on occation), Sakurazaki quickly scribbles down
Lovegood-san,
I apologize greatly for this, but I needed to take a few of your oranges for an emergency on the fifth floor. I promise to you that they were used for a very good cause, and you have my word that they will be returned to you in a timely fashion.
Thank you,
Your roommate,
Setsuna Sakurazaki.
and places it on Lovegood-san's pillow.