You have been seeing lots of mens trucks outside of your step-brothers house when he's at the gym. You know your step-sister in law has been cheating on your step-brother and you have always wanted to fuck her. This could be your chance to make her suck and fuck you. She admits what you suspected , she only wants to show her tits but you want more. You first say you want a blow job but change your mind and make her bend over and take your cock. She is worried and just does what you say as long as you don't tell her husband. She counts you down to swallowing all your cum.