Having the thought of Logan having another woman besides her, breaks her heart to pieces, as far as she knows, way back before, emperors are required to have concubines, only now, they are liberated to do anything they want.
As long as an heir is born, one can choose if he wants to add another concubine, for Logan's father, however, the one who pushed him to create the cure for Amor Gevaar, settled for only one woman, Logan's mother, even though he never loved her nor cared for her. He was that ruthless and so, Logan became merciless too when he overthrew him.
After all, it was his father who caused his mother's death.
"Yes. Don't frown anymore, you're prettier smiling" Logan replied, shuffling her hair a little bit. An act that's very rare for the two of them especially for the cold-hearted emperor, yet oddly enough, that moment, he felt being with Celestia has been by far, the rightest thing he has done in his life.