A Headcannon book where the OM! Boys notice, figure out and experience the monthly pains of their beloved female roommate.
PHASE I - NOTICING
They notice something is off about the human.
PHASE II - THE TALK
They ask the human what is wrong. Mind is now blown.
PHASE III - THE TORTURE
Asmodeus bring in a "Period Pain Simulator". Why not give it a go?
PHASE IV - THE AFTERMATH
They finally understand a piece of their human's struggles, and wish to help.
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