They both need psychiatric help, him for using violence to convince her that he is in love. And she, for mistaking possessiveness for love. She's just lonely and mistaking her happiness for being the object of his obsession. When this posessiveness his taken away, she feels so lonely that she mistakes her own desire of attention with jealousy. This is NOT love, still... I'm enjoying this a bit too much. I must secretely want someone to obsess over me. Is this why I like this, mmm... I might need some therapy too ?
Her-"I know you love me, but untie me right away, I'm your teacher".
Him-"I wont untie you until you admit you love me too". I'll do this by caressing you soooo gently and kissing you soooo gently and repeating " I love you, Ayano" sooooo much that you will be the one begging me to do more to you. Yes I did force you in this binding, but I won't do anything (else) with violence. I'll only kiss you on top of your clothes and will not abuse you sexually (unless you ask).
Him-"I won't sex-you until you beg me to". Fufufufufu ! "And if this still doesn't work I'll make you crazily jealous, until you beg for my love"
I might be crazy too but at least I geniunenly wanted to save the fish.
Honestly, why, why, all this violence.
Aishite Kudasai, Sensei