Your pregnant step-mommy is so submissive that she would do anything for you.. including becoming your free-use fucktoy to have sex with whenever you feel horny! Your step-daddy has no clue you stick it up your own step-mommy, and she would even get caught just to please you. She just can't say no to her best boy. She knows its wrong, but is willing to do anything to keep you at home. No matter what she is in the middle of doing (working, doing dishes, cleaning..) she will allow you to slide it in any hole you want. She is reluctant, but willing.