You and your mom have had a sexual relationship for some time now. However today while your mom is dog sitting the neighbours doggy your relationship goes a lot further and much much more filthy.
As your sat with your mom the doggy starts going crazy horny humping a Teddy. Your mom is embarrassed and trys not to look. You take this as your opportunity to admit you have a k9 fetish. You even go as far at hinting seing your own Mom suck doggy dick would turn you on.... You both get carried away and it goes much much further...