Dreams.
Demons didn't dream, but when he was in his human form, Azren was just like other humans who could dream in his sleep.
Sometimes, it was just a simple dream related to his daily activity. He dreamed about how he was driving Michy to the Seventius building, and he even dreamed about how he was cooking in the kitchen.
Those were just simple dreams, and Azren never thought too much about that. But, sometimes his dreams couldn't be said as simple. There were times when he dreamed that he kissed Michy. In the dream, he hungrily devoured the idol's lips before trailing down his lips so he ravished the slender neck that belonged to the young boy.
He even dreamed that he touched Michy's whole body without letting an inch of the skin escape from his warm palm. More than that, he once also had a dream of him and Michy making love hard and passionate.