"That was a productive month." Alros said to himself while looking at the two rock cocoon in his room. The two cocoons were created when his lustful state from his transformation into a Demon Lord ended, and the two lovers of his manage to endure for the entire month, on their own.
"To think you can just survive a month having sex with a Demon Lord of Lust to become an S-rank." he mused with a little amusement in his tone.
Then again, when he is in that state, restrain is not in his vocabulary and he forced the two women in many different positions, in a long period of time to the point there always exhausted by the end of it.
Not to mention, he did not even sleep during the month, spending it on fucking the life out of Mina and Lina, with both women enduring to the end.