When there were two stubborn people in a single room, only a single taunt was enough to provoke the other to agree on the other's taunt. Which was what happened to Beelzebub who smiled in response to held back his frustration of being unable to reject Esther, "All men are wolves and you would be better not in a room with a wolf."
"Thank you for your concern," Esther snatched the key from the innkeeper's hand. "But I only see a toothless dog that could only bark in front of me."
Inside the room, Esther sat on one side of the bed while Beelzebub sitting on the other side. None of them want to stay out off the bed and sleep on the couch out of spite.
While Beelzebub wanted to show by his action he has no interest in her to stop Esther for her own good, Esther wanted to test Beelzebub as she could feel the burning emotions from him. She refused to believe the affection he showed in his eyes to her was only an illusion.