No

"Bullshit" She mumbles through gritted teeth before stomping down on his exposed balls, crunching them into the edge of the chair.

The boyfriend screams before rambling;

"Oh God babe no please! I'm sorry for whatever I did! Please stop! Ahhhh!" As your sister continues to stomp and pulp his balls between her foot and the hardwood seat.

You grin to yourself from you hiding spot while jerking off as you witness your sister unnecessarily about to castrate her loving boyfriend.

Finally, with all the **** she can muster she stomps on his rappidly swelling left nut, popping it spectacularly and with a loud, wet *SQUISH*noise that you can hear even from across the room.

"No.... please.... leave me one at least..." the boyfriend sobs to himself.