Yes

You realize that your younger sister has not only beaten you, but humiliated you in front of her hot friends. You give in to your fate and weakly tap on Megan's ass.

"Oh my gosh, I can't believe you just tapped out to your sister's ASS!" She giggles with her friends as she shakes her ass all over your face. "You're going to be under here for a LONG time bro, so you better get used to it! Might as well start worshipping me now. I am the superior sibling after all."

You start struggling against Megan because you don't want to give in to her.