The Diary of Golden-Haired Sylvie

A Demon Lord's castle from the start, and every girl is picked up along the way.

Sylvie: "You evil Demon Lord, stay away from me!!"

Some time later:

Sylvie: "You said you weren't interested in humans! Why are there more and more girls in the Demon Lord's castle? You jerk!"

Shen Ke shrugged. "They all fainted right outside my home. How could I just leave them to die? Besides, they chose to stay. I can't drive them away, just like you."

Sylvie: "I don't care! You can only sleep with me!"