You don't even know the culprit?

"...It was a pleasant sleep."

Lith looked at his teacher and noticed her messy hair and still sleepy face. Even without her words, he could tell that she had a pleasant sleep.

"I'll go have a shower and see you at the dining table for breakfast." Lith said as he got down from the bed.

"Mhm." Arya hummed in agreement as she tied her hair into a ponytail.

Lith went ahead to freshen up and Arya simply cast a cleaning spell on herself because she was too lazy to go shower. She ordered food for Lith and herself and after it arrived, placed them on his dining table and awaited his arrival.

As she was sitting at the dining table, she started recalling last night and her time sleeping with Lith. At first, when Lith wrapped his arms around her, she felt nothing from it at all. Sure, she could feel Lith's body, but there was nothing else apart from it that she felt.