Tag is to be used only when the protagonist (male) has a breast fetish. Meaning that he is sexually attracted to breasts in an abnormal manner. It is recommended to use this tag only in the case of a male protagonist.
I fell in love. Her name was Shirasaki Yukino. I could only look at her from a distance. However one day I heard that she already had a boyfriend. Even if I love her, I can’t have her. The devil sent me an invitation. I can make her mine!