World of Step-sisters #78 - a Very Caring Shop Assistant by Misskitty2k

Back to part 78 of Word of Sisters, let's go!

We think there is a correlation in sperm activity thanks to unique gene mutation in your DNA.

Simplicity makes your sperm go "rrr rrr... rrr

I was afraid my condition was one of the negative side effects of my life.

Damn, it has to do something with the last curse of uncontrollable erection I received in my dream.