Fem reader!

Estarossa, one of the Demon King's children, obtained a commandment, that of love. Since he was still a child, he didn't know how to control his powers. So, Meliodas and Zeldris asked you to help him with that. Estarossa admired you greatly, so you accepted. You were a very powerful commandment, so you taught him new things. At one point, Estarossa fell in love with you. Today, you were teaching Estarossa some techniques.

Estarossa: Wow, you're incredible, Lilith.