Cassidy got tired of messing around that morning.
Adrian probably sucked out her energy when he sucked her finger earlier. She felt lazy to the bones. Because of that, she just decided to coop herself up in her bedroom and lock the door to avoid a certain human-hand-harasser from entering.
"Or it's just because I played too much with the boys yesterday...?" she wondered out loud as she continued lying on her bed and burying her face in her pillow.
"Well, I enjoyed it, anyway. Been a while since I played that much."
Cassidy recalled what she and her nephews did after swimming until noon yesterday. They freshened up for a while once they got back in the mansion. Afterwards, they proceeded to play some board games, tag and hide-and-seek. At some points, they just talked idly among themselves.
Looking back at those now, she suddenly starts missing the other children in the orphanage.