Headcannon number 1- Sometimes just to piss Ishimaru off Mondo will try making an attempt of kissing Ishimaru.
Headcannon number 2- Ishimaru makes Mondo be on time to his classes. (Except when Mondo skips class of course-)
Headcannon number 3- Sometimes Mondo accidentally goes to school in his PJs and Ishimaru sends him home to change causimg Mondo to be late to a class.