Push her knee away

**** to alleviate the pain if your balls you reach down and try to push her knee away but as you manage to move your sister's leg, she immediatly grabs hold your balls, on in each hand.

"Sis don't do this! You know I want kids," you please as she increases the pressure on your gonads. Unfortunatly for you all she does is increase the pressure more and more until...

POP!

Blinding pain shoots through you aand cum jets from your cock as one of your balls rultures in your sister's hand. By now you're powerless to resist as she moves both hands to your last ball and crushes down until

POP!

You spew your last load all over the hands and stomach of your sister, the girl who castrated you.