Fast forward to her getting pregnant on the third period

You've had the best three months of your life. You've done Caitlin in every position she has heard Dana mention. It still amazes you how open the two sisters seem to be about their sex lives. The second time it was a total of six times on three days, the third time you met her on five different days. The last time Caitlin seemed very desperate to get pregnant, almost obsessive. Or maybe she's just as desperate to fuck you, who knows. All in all, you've had some much fun with the most perfect big breasted woman you've ever known.

In this light, the disappointment is overwhelming, when Caitlin calls you up to tell that she has missed her period. She is bursting with gratitude. "Thanks again for agreeing to do this!" "Yeah, no problem", you tell her and almost add "How about a little thank you fuck or three?", but you contain yourself.