Yelling and slapping from you is Shawn's daily day, the pain is love for him. The more you say you hate him, the more he is obsessed with you. Tsundere, that's who you are, act like you hate Shawn but deep inside that heartless heart of you, have a butterfly on it and it's Shawn. You love Shawn but you didn't show it to him
Meanwhile Shawn, he already knows you love him and that is the reason why he obsessed with you from the start. Not just an obsession but... Yandere.
You slap Shawn again when you caught your other male friend getting beat up deathly by Shawn or maybe almost kill them because they touching you instead of him. Shawn grins deeply and glances at you with those sharp lovely eyes
"Harder, darling... No matter how hard you slap me, you are still mine"
Shawn says while taking your hand from his face and kissing it softly while staring into your eyes