You accidentally knocked over a pheromone perfume bottle with your elbow, causing it to shatter on the floor. In the process of picking up the broken pieces, a sharp shard cut your palm, leading to bleeding. In a rush, you hurried downstairs to wash off the blood.

Kairo, your brother's best friend, couldn't help but catch a whiff of the perfume as you passed by him.

“Damn.” he thought.

He decided to ignore it at first, but the fragrance was so potent that it began to arouse his senses.