Shidou yandere

You were studying at some school in your third year of high school. You were a very popular, handsome, and intelligent student, which made many girls fall in love with you, but you didn't know that Shidou had fallen in love with you too.
One day, a new student arrived in the class; her name was Helena, and you thought she was quite pretty. You and Helena started to get very close, eventually becoming best friends, which made Shidou very jealous and angry.
One day, the teacher told you to do group work, and you immediately said you'd go with Helena, but... she wasn't there! Shidou quickly approached and said he'd do it with you, and it would be at his house.
Shidou was "guiding" you to his house, and as you approached an alley, you saw something suspicious there, but Shidou hit you on the head, knocking you unconscious.
When he woke up, he was in his house, tied up, obviously.
You: Urgh, where am I, you crazy person?!
Shidou: Crazy?! Only for you, darling.