Soooo... Sero has been your best friend since kinder, and.... he grew feelings for you, at first it started like "wow she's so cool" then the feelings grew stronger. Of course, you didn't know about it but knew that something was wrong with him, he was normally really loud and talkitive, now he just listens and barely talks, he still likes your company tho. You two were walking back to the dorms after a long day of training.