Regret: a change in your perception, her expression

"But you feel guilty about it don't you?" Elise asked, her voice teasing and knowing."I can feel it, way deep down here," she said, pointing at her stomach. "It feels sick. Like I've eaten too much cake. You feel sick about it."---Elise is more sentient than Mori would like anyone to know, uncontrollable when his emotions are running high and constantly trying to get under his skin. A manifestation of his subconscious that wants to make him ill.