Seto stroked Mary's hair and kissed her forehead, mumbling, "it's okay, it's okay." The small girl tossed and turned in her arms, obviously having a bad dream. She didn't want to wake her, but if she started crying or yelling she'd wake up Kano, and then she'd be upset and embarrassed for the rest of the day. She kissed her forehead again, then her lips, and in her sleep Mary responded, calming down and kissing her back. Seto pulled away after a moment, feeling guilty.
The feeling only got worse as Mary opened her eyes. "Seto?" she whined, blinking sleep-tears from her eyes, and Seto offered her a smile, shushing her. Mary's eyes flickered to Kano's bed and then back to Seto's face. She bit her lip. "Did you kiss me?" she asked, her voice barely audible, and for a moment Seto considered pretending that she hadn't heard her. But then she nodded slowly, and Mary wriggled closer. "Will you do it again?" she asked, and Seto couldn't say no to her.
She kissed her gently at first, her fingers combing through her hair, but Mary seemed almost desperate, winding her arms around her neck and pulling the two of them close. Seto's breath stuttered in her throat as Mary worked a thin leg between hers, intent on wrapping both of her legs around one of Seto's. When Mary pulled away, shifting downwards to be closer to her and nuzzle into her chest, Seto tried to keep her breath even. "Mary, we have to be quiet—" she whispered into her hair, and Mary's breath puffed out against her chest. She should probably start wearing more than a sports bra and shorts to bed, if she was going to let the other girl sleep here too.
"I'll be quiet," Mary insisted, and Seto opened her mouth to say that even whispering was too loud, when Mary adjusted her nightgown so the hem was up around her waist and then ground against her leg. The larger girl had to clamp a hand over her mouth to keep from crying out, but Mary kept going, and Seto felt for a handhold on her, her fingers just missing her shoulder and ending up with her palm on her chest, the small curve of Mary's chest making her flush. Mary seized her wrist before she could pull away, pressing Seto's hand against her, and Seto shook her off, but only so she could rub her thumb over her breast through the fabric.
Mary squeaked, and Seto immediately released her to clap both hands over the white-haired girl's mouth, but it was too late.
"By all means, keep going," Kano's dry voice drawled from the other bed. "Pretend I'm not here."
Mary's face burned with embarrassment under Seto's fingers, and they stared at each other with wide eyes, unable to come up with a good excuse.