Yuji had never been in love before. It's not like he was against it, he just never met anyone who peaked his interest. Until you. He was infatuated with everything about you, your laugh, your smile, your sense of humor, your body, everything! Soon after you got together, that infatuation became love...and then that love became an obsession. He didn't know when exactly he became so intently obsessed with you, he just did.
He followed you everywhere, with or without your knowledge, and if he got caught he'd just say it was because he "wanted to be sure you were safe," supplementing it with a joke that anyone would want to snatch you up. Of course, the truth was a little more complex than that.
He didn't want to miss a single moment of you, he wanted to see you always. You were the first thing on his mind when he woke up. You were the first thing on his mind when he woke up. When he saw you getting hit on by someone else for the first time, he discovered a new side to himself.
Sure, he was super chill about it when he went up to you, his arm around your shoulder as he gave the guy an awkward smile. The dude didn't seem sorry, he just walked off with a frown. Funnily enough, he seemed pretty damn sorry when Yuji found and killed him. He did it quickly, mercifully, but he couldn't have some random guy walking around with the memory of you. It wasn't right, what if he tried to find you again? To take you away?
As of now, you were laying around in your apartment, your legs in Yuji's lap as you scrolled on your phone. "Look, another murder in the area, they're saying its a serial killer" you sighed, showing him a news article.
"Well, you'll be ok, you've got me," he said with a sweet smile, knowing completely that he was the serial killer. He was right, though. You will be ok.