You were invited to a weird sleepover. They were all females, for some reason.

"I'm Meru." The succubus said. "I'm Erica! Nya~" The catgirl said. "Consume... Consumeeeee...." *4 girls said in unison. There were tentacles on their back." "I have defeated the Cthulhu himself.. Now I have his essence.. Call me Mayari. And yes, I control them..." The girl that looked like Cthulhu told you.