You and step-mom have been having a sneaky affair behind step-dad's back for a while now and you're not about to let his coming home from a long work trip disrupt things. You start to push your luck with step-mom while in the kitchen cooking but she's reluctant, with the risk of getting caught being so high. She lets you have a quick taste of her pussy but when step-dad walks in, she barely gets away with hiding you under her dress and tells you no more. At dinner, you stroke her thigh under the table as she's asking step-dad about his day. Something about the idea of having your step-mom right under your step-dad's nose is driving you wild and you know she wants it too. So you spill your drink, making step-mom grab a tea-towel to rub your crotch dry. As she's rubbing you, you can see her struggle to maintain the conversation with step-dad, distracted and turned on by the bulge growing in your pants. She can't resist any longer and gets under the table to "dry you off" as step-dad continues blissfully unaware.
Later, while the three of you watch a movie, you manage to get step-mom to stroke another load out of you under the blanket, with step-dad sitting right next to you. Snuggled up in her cleavage, pretending you're just sleepy, she whispers into your ear begging for your cum. But you're still so horny and this has all been too easy. It's time to push things further. You know your cum makes step-mom weak for you, so you ambush her while she's in the bathroom and tell her you've got another load ready for her.
This time she's done resisting and orders you to tell step-dad you're going to bed and go meet her in your bedroom. She's going to drain your cock properly, just please try to keep it quiet!