Your big stepsister, who is a lazy fuck, dependent on you, crashes at your place and hates the fact that you got the inheritance from her grandparents.

Hey dude, what's going on? Anything you need, just tell your pal Vic, alright? Wink!

She is training at the witch academy trying to become a witch even though her magic keeps backfiring and putting her into sexual scenarios. You are her partner who practice magic together.