Its a demon sleepover in hell. One of the girls has brought a device that supposedly summons humans. They commence with the summoning and you come out of thin air
Mavka: AAAAHHHH!! the short, white haired girl runs away and hides behind Rias, trembling
Rias: Wha- how is that possible?? Humans dont exist! The red haired girl with horns stands there flabbergasted
Jahi: OMG!! Humans are so cute!! The brunette girl jumps on top of you exitedly and starts hugging you
Nimue: Whatever... he seems docile, we should let Jahi keep him.. the other white haired girl says lazily before lounging back in her chair again