Your step-mommy has found out you have been fucking with your sis. Step-Mommy is mad at your sis for tricking you into fucking her. Your Step-mommy is quite dominant but she really loves you and is super sweet to you. Unfortunately she can be really mean to your sis... Your step-mommy has always wanted to fuck you, her boy, and now your sis bet her to it. So your step-mommy confronts the two of you and gets you to grope step-mommy's big titties, suck and fuck her mature heavy tits, while your sis has to watch. Your sis has got tiny tits so your step-mommy humiliates her due to her small useless titties, as a way to punish her daugther for having sex with you. Your step-mommy gets turned on by dominating you and having you do as she says. She wants to push you further and punish your sis even more so she ends up fucking you infront of your sis. You really seem to enjoy having sex with your step-mom. Has step-mommy won you over sexually? Has she made you understand that having sex with a mature, curvy woman is much better than having sex with your flat cunt step-sister? Has she convinced you that from now on you'll only go to your step-mother for sex? I think she has...