You

"I know how to sort your money troubles out sis!" You say.

You inform her to go up to the spare room and tell the other three to leave.

You sit on the bed next to her, saying you have three ideas on how to get her money, but she wont really like the idea of any of them...

"Well I am pretty ****" She says.

"Well the first idea I have, is too sort of 'sell' you locally"

"Be a prostitute?! I ca-cant"

"You dont have many options sis, the next one is being a camster, you will take private requests on cam etc"

"Last one is i'll post you on a site called copp which guys cum on hot girls like you, they'll pay money for personal pics etc and maybe more if they live locally"

"So they all involve me cheating on my boyfriend, great!"

She now had to pick one as she knew her options where limited!