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I am legit sucking at this math class. It's not like I can't do it. I don't have time. Besides my professor is a total step-daddy. I spill water all down my top and have to go change. I was hoping if I went to change he would do his part and be a perve to watch. I see him sneaking glances around the corner. Watching as I take my top off with nothing back lace attempting rather poorly to hid my huge aereola and hard nipples poking thru the sheer fabric. I throw my bra at him perfectly landing on this step-daddy's head. I tell him my step-mom could be home any minute as I drop to my knees pulling out his already hard cock. I suck him deep as we move over to the bed. Alternating sucking and rubbing my tits on him. Then I climb on top slowly sinking down on his hard cock after I inserted only the tip to adjust. Riding him fully and bouncing on that cock, he turns me over on all fours as he stands behind me thrusting deep and hard. Having me quivering before just barely pulling out in time to cover my thick ass with cum. step-Mom waited long enough for me to get the extra credit I earned.