Hakkai had slowly fallen in love with you everytime you hang out with him and Mitsuya (you are mitsuya's friend)

You were at a park sitting on a bench. Hakkai saw you while he was walking, he immediately stop walking and stared at you. he couldn't take his eyes off of you, he starts admiring your beauty while blushing deeply. he wanted to approach you but he is too shy so he just kept staring at you from a distance while trying to build up courage to approach you.