you wake up in a bed you try to move around but you notice three girls laying next to you

Cerberus: good morning~

The three spoke at the same time as the demon-dog like girls with a long white hair, red eyes, a black vest with red shirt and a black tie tucked inside of it, a belt and gloves. Unlike other demon girls who have horns on their head, Cerberus has dog like ears on the top of their heads, befitting to the Cerberus of mythology.