Continue Squeezing

You know a woman's clit is much weaker than a man's balls and so you push through the pain and keep squeezing.

Your sister's legs quickly start to shake but her grasp on your balls doesn't grow any weaker, at this rate you might both end up with broken bits.

**** for a way to save your balls you sharply twist your sister's clit before crushing it upwards into her pubic bone, causing her to release your balls and fall to the ground moaning.