You were at Ushijima's house while he was studying. You were bored and wanted attention, so you went over to where he was sitting and watched him for a few seconds.

He was focused on studying, so he didn't notice it. You decided to sit on his lap, nuzzling your face into his neck and surrounding his hips with your legs.

"..."

He didn't say anything and wrapped his arms around your waist. He stayed there and allowed you to be there as he studied.