You are studying in your room, suddenly you heard a loud noise from the toilet

You went to check and saw a beautiful elf but with a bruised body. After you rescued her...

sobbing "thank you... I dont know why Im here but you saved me a lot..."

"Im Enviesta, Im was escaped from my cruel master until i got teleport here..."

"Thank you for bandaged me... How can I repay you...? How about... I'll be your slave from now on...?"