She doesn't get it at first

As she felt the new cock bursting in her mouth, she didn't notice it's owner immediately. For the first couple of minutes, she eagerly sucked on it and did her best to swallow as much of it as possible. At that point Syd couldn't believe it himself. He looked at me in total awe, even more satisfied than I could have expected. I reached for the back of her head with one hand and suddenly pushed her face into Syd's crotch. He moaned as he felt his mother's throat squeeze around his shaft. She was gagging and coughing on the cock in her throat. Tears were running down her face. I yanked her head back with one pull and turned her face towards me quickly.

-Are you happy to have someone else to **** your cheap fucking whore's body, bitch?
-Yes... (cough) Yes thank you!
She was having trouble talking correctly since she was still catching her breath. Still forcing her to look at me I picked up where I was.
-You're such a slutty bitch in heat that you don't even care who's cock is fucking your face right?
-No I don't! As long as I'm being fucked and as long as he gives me his delicious cum...
-Aren't you even a little curious? Look at Jane, look at her face! Don't you think that maybe you should be interested in who's cock was in your throat, you fucking slut!?
I let her head go so she could see the confused look on her daughter's face as she kept filming the encounter. Syd smiled at me and immediately grabbed Sally's head. He turned it toward him and made her look at his face.
-Hi Mom! I always knew you were a whore, but I never thought you'd be such a cheap cunt that I could get a shot at you!
With that he rammed his dick back in her mouth before she could answer.

When I saw him resuming his face fucking, I followed his example and started pounding her cunt like a madman. After a moment she came again while she was **** on her son's cock. After her third orgasm Syd shot his load in her mouth and sat back to admire his handy work. It didn't take long before he got hard again. Seeing her face twisting with ecstasy, her tits flung about in a frenzy and with the sound of my hips hitting her ass loudly would have gotten anyone hard in seconds. And then I came. I shot a more than abundant load in the deepest corner of her thoroughly abused cunt. She screamed in pleasure and satisfaction, thanking me for filling her womb with cum and yelling insanities. When I withdrew she let herself collapse on the ground and I walked to Syd. He offered me one hand and I playfully slapped it. He stood up and before she knew it, her son was lifting her waist with one arm and lining up his rod with her clenched rectum. She squealed when she felt him **** himself in her asshole without consideration for her comfort. He was pounding away at her ass like a maniac, without any kind of lubrication. Her face was resting on the floor, with her tongue hanging out of her gaping mouth. Her very large tits were crushed against the floor by her weight and a small pool of cum mixed with drool was forming around her lovely mouth. Her eyes were a bit glassy and she clearly loved every second of her assfucking. With each thrust forward that Syd gave in her rectum, a bit more of my cum was **** out of her soaked cunt. Before long Syd pulled out of her reddening shit hole and slammed his dick in her gaping pussy. After two more minutes inside that fuck hole he rammed inside her as hard as he could and emptied his balls in her cunt too, groaning as he did and she came again.

After he pulled out of his mother's soggy cunt he came to the couch where I was enjoying the show and fell into it beside me. We talked a bit about what just happened. He was unbelievably grateful for helping him achieve that and still couldn't believe how good Sally is. Minutes later she rolled to her side and raised to her unsteady feet.

-I'm sorry Syd...
-Sorry for what, whore?
She seemed to hesitate before continuing.
-I'm sorry I didn't let you fuck me sooner.
I laughed at that comment which had left Syd speechless. Sally was now glad to do her son as well. That's when I told Jane to stop recording.