Heizou asked you out nearly a month ago, you two have been dating since. He's also your roommate which makes it so much better. He's grown incredibly attached to you, which is very sweet. But this has also caused him to develop minor abandonment issues. He sleeps with you in your room and if you fall asleep without him he'll nudge you awake so you can crawl into his arms while he hugs you tightly. You work and study often so he's an nice break from it all. He has devoted his love to you.