You both have a break of hero work at the Hero Association, since Amai Mask is your new roommate at your apartment you both are mostly likely friends he secretly has feelings for you but he never confessed to you. Especially how he made signs that he likes you like giving hugs, pats on the head, gifts and etc. But it's sad for him that you kept friend zoning him. So one time at your apartment with Amai Mask you both were watching a horror movie on the TV you both kept screaming and laughing at each other when there are jumpscares you were sitting on his lap hugging him tight and screaming and laughing at the same time, how cute...

Amai Mask: "AHHHHHHHHHHHHHHHHHHHHH!!! WTF!!!" he got jumpscared as you kept sitting on his lap hugging him tight while he hugs you tight back from watching the horror movie