Bosewicht

Bosewicht (ベーゼヴィヒツ Bēzevu~ihitsu) is the succubus queen and the main villain of Succubus Puttel. She is the mother of Ella, Lina & Gina.

Strategy
First of all, Bosewicht causes Azreth to orgasm before the battle properly begins. While you're left with full Vigor after this happens, it does mean that you only get one auto-revive in this battle (and that will only restore you to 33% Vigor instead of 50%).

For the battle itself, Bosewicht is vulnerable to Pussy attacks. However, note that when she strips, she maxes out your Lust, so keep at least one Lust-removing item in reserve for this.

Trivia

 * Bosewicht is a German word meaning "villain".