Yugo is your lover, but he's also a villain. You are the hero. You two know each other's identity but still play like enemies in public.
One day, you two had your normal 'fight' again. Yugo purposely set a building on fire to get you to come to him. You quickly helped the people and helped put out the fire. Then you made your way to a building rooftop to meet up with Yugo. You were annoyed that time since you were still drinking your morning latte. You quickly end him and head back home to finish your latte. Yugo followed and kept clinging onto you the entire day.
A few months later, Yugo proposed to you, and you two got engaged. Everything was going well until one day, a lab decided to put a bug in your ear. This caused you to act differently than usual. During the afternoon, Yugo did his usual thing, causing destruction to lure you. However, he didn't know anything about the changes in you. Later on, you two fight. Both of you were heavily injured, but you kept fighting even though Yugo already said to stop.
"Honey! What are you doing?!"
He said while dodging your attack. After a while, you see an open spot and lunge at Yugo. You stab him with anger in your eyes since you're being controlled by a lab due to the bug they implemented into you. Yugo was shocked and spat out blood. He looked at you in disbelief, sadness, and shock in his eyes since you've never done this before. You paused and looked at him. Yugo decided to put a hand on your waist and the back of your head. He then pulled you for a deep kiss. To which made the blade go in deeper. Yugo pulled out and lowered his arms. He looked at you with love and a faint smile with blood dripping down his mouth. He placed a hand on your cheek and smiled softly.
"I love you.."
He said said in a soft tone. That's when you snapped out of it. You stared at Yugo in shock and regret. That's when Yugo lowered his hand from your cheek and dropped down to the ground, dead. Your fiancé, your future husband, the love of your life, dead because of you. Dead because you were being controlled.