Unexpected consequences with Mom

At first you are just excited, of course for the fact that Robin isn't pissed at you, but also your sexy sister lover turning her hot ass to you to rail her. You happily oblige her and push your cock between her legs. She reaches down and lines it up, parting her pussy lips with the head.

You grab her hair in one hand and hip in the other and thrust deep in one push, helped by how wet she is and the saliva she left all over your cock. She starts moaning and soon you aren't even thinking of your slutty cousin and how well she had fucked you less than an hour earlier. You just think about how good Robin feels and how close you are getting as she starts talking dirty.

"Yes! Stretch your sister's tight pussy!"

"Fuck me, baby! Give me that brother cock!"

"I can feel you getting close... You know that pussy is better than Quinn's."

Each time she speaks your grip on her gets tighter. MYour pace gets faster. She is right, you are going to cum, and hard. Your grunting triggers her to send you over the edge with her words while she pushes back against you. "Yes, give it to me! Cum inside your dirty little slut and fill me!"

You explode and fill her. You have to pin her to the wall to hold her up while her own orgasm shakes her then takes her strength. You continue pumping in her fuck hole while it milks all the cum out of you. Then you pull out and let her turn and lean against the wall. You kiss her hard while you both catch your breath. Once she does, you smile at her and order her. "Be a good girl and clean that cock. I want you to taste yourself."

She just smiles and moans before slowly sinking down to take you in her mouth and thoroughly clean the mix of your juices off you. She moans as she tastes and sucks on you, clearly enjoying herself. You are of course loving it, the submission as well as the cock worship. Then Robin really takes things to the next level.

Robin pauses her work on my cock, looking up at me while she continues stroking it. "I can't remember why I left when you were going to fuck Quinn. It's so hot thinking about how bad she wants my man, and thinking about hard you must have fucked that little slut. I bet she came so hard on this big cock." Her words made your cock jump in your hands. Robin giggled. "I guess there's my answer!"

Robin puts your cock back in her mouth and sucks some more, swirling her tongue around the tip before sliding you out with a nice 'pop'. Then she really escalates things. "You know, there's someone else I know has been eyeing you..." She asks, pausing to leave the thought hanging. Where is this going? She again looks up at you. "I've seen mom looking at you like a piece of meat. Since she carried us, gave us birth, and raised us, it would only be polite not to deny her this pleasure, wouldn't it?"

She leaves it as a rhetorical question, going back to sucking me. Holy shit! You hadn't even considered this when you wrote the new rule! Not only were you getting out of trouble for fucking Quinn, but now Robin is encouraging you to fuck Mom?! There is a moment of panic as you wonder if it could be a trap, so you try to play it safe with something that can both agree and that you can play off as a joke. "Well yeah, it would only be polite..."

Then Robin makes it clear that she's not joking or baiting you. She looks up again, giving your shaft a long lick from the base to the tip. "Text her. Text her right now, but this time... I want to watch you fuck another woman."