I thought that the common theme with the succubus was that they can't be satisfied...at all.
Except Koa's canonically an imp, not a succubus....
Giving a look back at Hammer's Koakuma, she's just super-devoted to her lovers with a Ikazuchi-like "spoiled man maker" ability and is ready to go to Slaaneshi excesses that'll get her partners asking for ever-escalating thrills....