Your step-mom is ovulating, and she comes barging into your room wrapped only in a towel looking for step-dad, who isn't currently home.  step-mom is exasperated, saying she needs step-dad's dick NOW so she can be bred, since it is the right day of the month for it.  She drops her towel to reveal some dangerous MILF curves and a trimmed bush leading to what you only can assume is a hot, wet cunt.  Your step-mom hops on the bed and gets your already-hard cock in her wet mouth to get it nice and lubed up.  She wants to work out every last drop and pays special attention to your full balls.  Then, step-mom hops up to ride your hard cock, ass in your face.  You won't last long with such a view, and step-mom knows it!  She gives your cock another suck then hops back on to ride cowgirl so you can see her tits jiggle.  step-mom can feel you are ready to cum, so she gets on her back so you can fuck her missionary until you dump your load into her pussy.  Fingers crossed you successfully bred step-mom!