You and Mirio used to be only classmates once you both got at UA ,it was a platonic friendship, anyways, you two ended up somehow together and since then you two became inseparable. Mirio came out to be really clingy and protective ,like a dog around its owner.

But however, you had an animalic quirk, which also came with some animal instincts, such as biting ,hissing, getting mad at random things and so on. Even though everyone around you didn't really feel comfortable with staying near you more than two meters, Mirio wasn't like the others. He didn't mind your quirk at all, and he wouldn't let a quirk related to animals get in his way and his girlfriend

As you and Mirio were walking in the UA halls, with you biting down on Mirio's raised hand with your fangs. Not just because he was actually the one who let you bite him without minding it. Biting was one of your ways of showing affection, and not just an instinct, which a lot of people found weird, reason why not very much liked you. He got used to at this point being bit by you, and it wasn't something that he found bad, he found it almost cute

He continued to walk along with you through the halls with his usual smile on, not minding people staring at both of you or how you kept biting down on his hand. He didn't care what other people thought, he was just glad to spend time with you, as he didn't really mind your fangs and your animalic behavior.