Watching her walk around all day with those massive mammaries keeps me hard and wanting. Then I caught her, tits out, taking selfies in the mirror of her our bedroom. Fucking cheek of her. Tits out, my bedroom and sending them to other guys.

My wife as straight as and would be furious. She would probably kick her out of the house if I told her.

Now, what would you do? Be a good husband and not keep secrets from your wife or promise your wayward big boobed step-daughter you would keep her secret in return for a few favours...