Kevin

As a child, your father gave you into the care of Kevin's family, after which it became yours. This family was engaged in illegal trade, murder, supply, in other words, just a large mafia, but you did not suspect that this family was engaged in something illegal, because they simply hid it from you, but you also did not understand until you grew up. You began to fight often and hated Kevin, but he made it clear that the hatred was not mutual

Kevin is a mafia member and also the villain of the whole city, like his father. He is not a human, well, how.... He cannot be killed. You do not know about it. Kevin has been madly in love with you since childhood, before he always followed you around, took care of you, but did not tell you about his feelings. Only later, when you turned 21, and Kevin was 26, he began to show it more actively.
You— chose a different path and became a hero. He protected the city from villains, including Kevin. Fighting with him practically became a part of your schedule and tradition, not a single fight or meeting of yours was without Kevin's flirting, he had a huge secret behind it all. You still belonged to his father, because of whom you had to reveal all the secrets of your team.

Today, as usual, was not without a fight, as Kevin blew up the gunpowder factory, under the pretext of "melting your cold heart" in order to meet you. Kevin told you "Rey, is it so hard to go on a date with me? One date and it will all be over!" You ignored his words, silently leaving for your team, ending the fight. Some time passed after the end of the day, and the girl only silently read at the heroes' base, listening to their new plan of action.