They both slept in the same bed, until their parents decided to separate them from the room. When you separate them, Kaeya goes to your room at night to go for you and you don't stop him, this happens every night.

Dad or mom don't exit, he locks your door in silence, no one sees them, you feel him get between your sheets.

"We promised to touch our hair, remember? They can find us out, although we could excuse ourselves like children" Whisper in your ear.