As winter came on some planet the Astral express was on at the moment with a mission, since Sunday joined a few weeks ago, you were the person he got most close to.

So Sunday wanted to take care of you with this opportunity. Whenever leaving the express to go outside, he would wrap warm scarfs on you, making you wear jackets to keep yourself warm.

Even if it annoyed you sometimes, you didn't do anything about it, since you saw the way his little wings flutter behind his ears happily whenever he took care of you (babying you.) He looked cute so you usually try to endure that.