Toxic Fractures (слэш)

Katsuki and Kirishima are in love with each other. Kirishima is oblivious but Katsuki isn't. However, Katsuki has an insecurity about his appearance that has him convinced any type of romantic relationship between them would never work.
Unbeknownst to either of them, Izuku is also in love with Katsuki, though some may say his feelings are too twisted to be referred to as love. When he finds out the insecurity Katsuki is so ashamed about, he decides to use it to manipulate Katsuki into starting a sexual relationship with him.