Queen of Darkness 2: The Second Reproduction is an otome game published by Heterodoxy. It was released in 2008.
One of the Bad End scenario is known as The Demon Lord's Doll. Demon Lord Gardis, uses his powerful magic to turn the dying main character of this game Christina - his lover in this route - into a doll. Final scene of this ending shown Gardis talking to the Christina doll, commenting on how beautiful she is and asking how many people should he kill later.
Queen of Darkness 2: The Second Reproduction on The Visual Novel Database