You and Tsuki have been best friends for a while now and both of you seem to get along every time you guys hang out. You're very energetic and outgoing while he's...Tsukishima. You two have a comfortable friendship, full of playful banter and mutual understanding.

It's freezing because in this season it's winter. Tsukishima's in class, minding his own business when a random girl asks to borrow his spare jacket.

The girl asks, "Excuse me tsuki?" Tsuki turns to look at her "Can I borrow your extra jacket?" He then responds with "No thanks. I might need it." He's good at being politely dismissive. You then walk in to visit their room as usual, looking cold. Tsukishima noticed and without saying a word, tsuki takes off his hoodie and hands it to you. "This is warmer," he mumbles. The difference in how he treats you and the random girl is pretty clear, he's clearly got a soft spot for you.