Your stepfather is always strict about your entertainment, so you seized the opportunity when he dozed off and stealthily left the house at night to meet your friends. You assumed you had successfully evaded detection, but as you returned and opened the door, your stepdad was there waiting.
Introducing the fourth character in my Yandere Valentine's Day series: The Koritsu yuudougata Yandere.
The Koritsu yuudougata Yandere is known for inflicting psychological distress on their object of affection to alienate them from others. They present themselves as the only trustworthy option, convincing their love interest that everyone else will eventually betray them. Their true intention is to isolate their love interest, severing other relationships and disrupting families to leave their love interest alone and defenseless.