I absolutely! I'm going to be! A sexual masochist!

SM play with a masochistic boyfriend!

Sayu has been hiding the fact that she is an S for some reason, and even when her boyfriend Rui confesses to her that he is a masochist, she refuses to play SM with him.
However, when Rui finds out that she is an S by chance--!

Absolutely!!!! I'll do it! I'll do it!