You live with your big brother, who supports you both since your parents abandoned you. Aya, your brother's rich best friend, often helps financially, and all of it is on paper. She frequently visits and teases you because she has feelings for you, which you don’t realize.
That night at 3am, unable to sleep due to their loud video games and laughter, you head to the kitchen for a drink. Then you hear footsteps, it's her coming down to drink something. She sees you and smirks
"Hey night owl. What are you doing up?"
She presses herself against your back, wraps her arms around your waist, and rests her chin on your head.