Oh my! What's that? You didn't notice it was granny and grabbed what you thought was your sister's fine ass?! You two have been fucking around and *gasp* you haven't.... included ... me?!
Well, hey, your sister isn't around right now so granny's gonna be your new little slut. Granny's got a nice tight pussy for you but I really was wondering how you.. taste.
After slurping on your cock and taking a nice facefuck, I finally slip it in my pussy and ride you until you start taking over. You already came all over grannys face and tits, why not in her pussy too! Hell, I'll be your little cumslut and you can knock me up!