You get to fuck stepsister when you find her bad report card

Oh no, is that my report card? Did you find my report card?

Oh no, please don't tell mom. Can I? Can I?

Don't tell her, okay? Please don't. I know we haven't gotten along very well all the time.

I mean, ugh! You're my annoying stepbrother. Like, I can't believe that since our parents got married I've had to deal with you all the time.

And now you know my grades. This is great. This is really, really great.