I mean he’s gross and his sister is probably terrible but she’s absolutely stacked.

That’s satire, right?

Step brother Ben, what are you doing? That’s my male underwear!

Or is it a reenactment?

Or you could create and store up a sexual impulse based on fantasies you can justify using a combination of logic, morality and your own underlying personality, then have a good wank.

I don’t think anyone should fuck their sisters though.