Diabolik lovers boyfriend scenarios

Kou

He Notices You:
You were the school's wall flower. After your parents had abandoned you, you became a loner and had a hard time believing that 'love' was real. To you, love and affection was an illusion. You preferred isolation, personal attachments only got you hurt.
Kou Mukami, the school's idol, was used to the attention. He enjoyed having so many girls that were into him, and knowing that he could get anything he wanted from them. So when you walked right past him without so much as a glance, he became vexed. You became a personal goal. Kou Mukami was determined to catch your eye.

He Saves You:
Kou had no idea just how bad things were for you. He had intended to follow you home and do a little bit of research on you to see just what kind of girl you were, but to his surprise you never went home. No, you headed right for a small diner in the sketchy part of town, and started working.
He watched you from across the street as you served and bussed tables with no emotion. Well, he was watching until some old pervert started to grope you. He saw you give the man a warning, and the man completely blow you off.
The man went to reach for you when Kou grabbed his arm in a vice grip, "you really shouldn't touch another man's woman." You looked back up in surprise to see the school's idol defend you. The man looked at you, and you glared at him, "problem Sir?" The man sneered and slammed money down on the table before leaving.
You turned to ignore Kou and continue working when the blond sat at one of your tables, "no reward for your hero, Keneko-chan?" You shot a bored look at him, "thanks. Now are you going to order?" He blinked in surprise before smirking, "nothing much. Just your phone number."
You rolled your eyes before turning to leave, but Kou grabbed your hand, "at least let me walk you home Keneko-chan. It's not safe for pretty girls to be out this late alone." You glared at him, "I've done it for two years already. I'll survive. " Unfortunately for you, Kou walked you home anyway.

Friends:
Kou was a persistant one. No matter how many times you told him to leave, he always stuck around. You would never admit it out loud, but you actually enjoyed his bright personality. He made it a habit of walking you to and from work, and even offered to take you to school.
Once he learned that you literally had no one, he seemed to be a little extra protective over you. You liked the feeling, but still never let him too close.
You felt a pair of arms wrap around your neck, and a peck on the cheek, "good evening Keneko-chan! You're looking beautiful as always!" You gave him the 'really' look, "you always say that. And don't kiss me. Every time you kiss me, a fan girl somewhere falls over dead. With the rising body count, people are bound to catch on."
He laughed, and took the seat next to you, "don't worry Keneko-chan! I'd never let them take you away! You're stuck with me for life!" You groaned and dropped your head on the desk, and Kou chuckled, "ouch.... and hear I thought you loved me...."

Confessions:
It was your night off so Kou walked you directly home after school. Once at your door, you said good night, but Kou stopped you from entering, "why do you always try to push me away Keneko-chan?" You looked at him and sighed, "you let people too close and they leave you. It's better to be alone than hurt."
He frowned. He knew you had no reason to trust him, not after his reputation as a player, but he fell for you. You didn't cave just because he called you beautiful. You were smart, hard working, and stronger than you looked. "I would never hurt you, (Y/n)." You looked at him in shock, and he raised his brow, "what?" You just stood there in shock, "you called me by my name... you never call me by my name. It's. ... weird."
He smiled and laughed, "I tell you that I would never hurt you and you focus on the fact that I used your name? I swear it's one of the many things that I love about you!" You blushed a bit, "y-you don't mean that, Kou." His one hand cupped your face while the other rested gently on your hip, "but I do, (y/n). I love you."
You wanted so badly to believe him, but it was hard, "you'll leave. Just like everyone else." His eyes were no longer held their usual playfulness. Now they were serious, yet still warm, "I won't. I have no intention of letting you go. I love you, Y/n). I have for a while." You were about to protest when Kou's lips pressed firmly against yours. His lips were cold, but soft. All of your resistance crumbled, and soon you found yourself kissing him back, "I love you too."