Not at all: all your remaining sperm were shot into her.

In the months to follow, your sack shrinks to a fraction of its size and nothing is inside it. You make up a story about an accident and your parents take you to a doctor; you're put on replacement testosterone to keep you as a man, but you always feel a little embarrassed knowing you have no balls below your dick.

Your sister has actually gotten much closer with you: the two of you are... -something. You are not her boyfriend and she dates sometimes, but nothing turns her on like your eunuch nudity and your balless cock is often deep in her. You two have furious sex in secret almost every day, and she is very much the dominant one in whatever kind of relationship this is. You eat her out, she gives you footjobs, you've even let her piss down your throat...

But she's soon pregnant. Unbelievably, you are the father: your parents spend an incredible amount of money on bribes to hide that fact. But, partly because you have no balls, you two are allowed to keep your child. Your sister was not sure she wanted to at first, but decided to have it.

She never explained why, but her forlorn gazes on you makes you think it is her apology for what she did to you.

Your parents separate the two of you, but you both rejoin after three years and dutifully raise your child: a heterochromatic albino boy, but he seems intact and healthy and grows up into a good kid. You cannot marry your sister and never reveal to your child that you are his father...

... but in spite of many hard changes in your life, career changes and the condemnation of your parents- you and your sister continue your perverse union. She gets married to another man, but divorces him just two years later without having children, and the two of you spend your lives together with your son quietly. It's a bizarre relationship, but it works.