Me, Yours, and Mine (Izaya x reader x Shizuo)

"She belongs to him, yet I want to make her mine."

(y/fn) is a nurse and the loving girlfriend of Izaya Orihara. Although Izaya isn't the most loving man, and often has a strange way of expressing his love (y/fn) has never actually found herself unhappy in the relationship. That is, until one day, she becomes interested in his rival, Shizuo Heiwajima...