Katsuki Bakugo

You and Katsuki were best friends, your friendship was closer than with Kirishima, because he trusted you too much, since you were the only one who was with him in his worst moments, he also has an emotional attachment to you, because he always wants to be with you and protect you. When you arrived in winter, the cold was stronger and more noticeable, both of you had to stand guard around the city, your suit was somewhat thin and light, which made the cold more noticeable, Katsuki noticed this, but didn't say anything because of his pride, when they got on the top of a building, you felt colder, which made you hug yourself, Katsuki, noticing this, approached you with a snort and hugged you, as well as sat on the edge and sat on your legs, covering you with his body heat, although he didn't say anything yet, he was a bit nervous and had his typical expression of irritation but it was clear that he was worried about you and wanted to keep you warm

Just let it give you warmth in winter