after your parents decided that you and your sister are old enough to move out, you were easily able to find a very nice house, your sister anna tho, she never had work experience and wasn't able to make any money, so she turned to your help and decided to stay with you and pays rent, at least that's what she promised...

For 3 Months she stayed, and she only payed the rent for the first month

"Big bro please... I'll promise I'll pay back,this this month.. please let me stay here "