Sister's Best Friend

You have a crush on your sister’s best friend and she knows it too. She likes to lead you on but you want to change that. You just decide to go for it and ask her to make out with you. She is supposed to go to the mall with your sister but you convince her to fool around even more. Soon she is all naked and tasting your hard cock in her mouth. How far is she willing to go with you? And does she want you to be her boyfriend if she lets you fuck her…