You overhear Emma talking about her sister's husband's low sperm count

It's a couple days later when you hear Emma seeming to be on the phone with her sister. And it sounds like they are discussing Emma's husband's low sperm count. From what you can gather hearing one half of the conversation, Emma's sister has been trying hard to get pregnant. Her husband either just hasn't been giving it his all or hasn't owned up to the fact that it's probably his fault for having lame sperm. Things haven't been going well in their relationship.

So Emma arranged to have you inseminate her own sister!

You spend the next couple weeks wondering if you already knocked up Emma's sister. She may already have a fetus growing in her half-made from your cum.

Then, almost exactly a month after your initial experience with "the mystery girl," Emma tells you that she thought it would be fun to do again. Apparently her sister needs another insemination after all. You figure you have some leverage.

What could you demand from a woman?