She senses him watching her

This is a remnant of the origin of this as part of a sexual hive-mind story. I edited it a bit to fit in here, but it's still very much going towards immediately having everyone actively trying to spread things like a virus.
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She began swaying her hips as she walked, and talking smaller and smaller steps, drawing things out, shaking her ass back and forth at him hypnotically. When she got to the door she stopped and bent over at the waist, one hand languorously caressing the frame and the other reaching back to give her ass a firm smack.

"You want this tight ass of mine," she said over her shoulder, again effecting that sexy tone of voice. "All that worrying, all that wanting your prudish mama back, when really you just wanted your hot sexy momma to shake her ass for you," she added, caressing her ass. "You want to feel it. You want to FUCK it. My body exists for you to do whatever you want with it." She turned back to him, dropping her robe entirely and pulling aside her panties. She sensually licked a finger thrust it slowing inside of herself. "You want me, and you can have me," she said, thrusting her cunt at him as she continued to finger herself, caressing her bra-clad boobs with her other hand. "You want me, and I want you to have me. It's my purpose. I need you to have what you want."

"I didn't imagine it," John said almost in a whisper, as he watched her play with herself. This was his mother, the woman who gave birth to him, who raised him... And she was so hot! Her big tits, barely contained in her bra. Her tight pussy, spread open as her finger went in and out, and as he watched she added another.

He couldn't look away. He had been surprised and freaked out, but he wanted more. He wasn't sure what had changed, but now that his panic had subsided, suddenly he was as certain about this as that he needed to breathe, of how gravity worked. Because he wanted her, she wanted him.

He got up and went over to her, reaching out, voluntarily taking hold of her breasts. She crooned in pleasure at his touch. He pulled off her bra violently, making her gasp, then squeezed and caressed her, enjoying the sounds she produced in response to his touch, and the sound of her fingers thrusting wetly in and out of her cunt.

"I am yours. This body is yours. I can play mommy for you, or be your fuckslut, or your girlfriend, whatever you want," she said, half moaning. "I can be as smart or as dumb or as anything as you want. I can be a Milf or a coed or an 18-year old virgin waiting for you to deflower me. Anything you want." She frantically pulled her fingers out of herself and reaching out to unzip his pants. He could see her her juices running down her thighs in anticipation as his dick bounced free. "Do it! Do what you want with me!"

She starting jerking John's dick, and he pinched her hard nipples, first one, then the other, as she thrust her breasts into his questing hands. He reached behind and grabbed her ass, pulling her toward him, and she guided his dick into her wet pussy. He planned to do it slowly, savoring it, but as soon as he made contact, as soon as he felt her tight pussy against his dick, he grabbed her ass tightly and slammed all the way into her in one long, fast thrust. Both of them screamed in ecstasy.

He slamming her back against the door frame, and she crooned her approval as he pounded in and out of her. They were perfectly synced, her moving exactly as he wanted, the perfect pressure on his rod, the perfect thrust back onto him, the perfect pull back away until just the tip was inside, never even slightly awkward, in and out just at the right pace, at just the perfect angle, with the perfect force. For an instant he might have thought her pussy felt a bit loose, and then it clamped down on him like a vise. Her tits pressed against him, dragging up and down his cloth-covered chest. He pulled his shirt off in a rush, and now her hard points of her nipple pressed into his skin directly, the heat and softness of her boobs spread across his bare chest.

Up against the door frame was awkward. She pushed again him and maneuvered them over to the bed, twisting and caressing him to guide his backward motion, managing to do get them to the bed without his dick coming out of her. He sat down hard, and she sat on him, thrusting down onto his body, and he let her thrust herself onto him, watching her tits bounce. She arched backwards and thrust on him, and he could swear he saw her tits perk up just a bit, lose just a bit of sag, rise just a bit higher, and then she thrust on him again and they bounced even more perfectly. He reached up to play with them, grabbing her, fondling them and playing with her nipples.

He loved this, watching his mother fuck herself up and down on him, doing all the work. Just as he began to think about trying other positions, she flipped them over. She lay under him now, and he pounded her from above, using her boobs as leverage to thrust into her savagely as her ass got slightly plumper to give him and even better cushion to thrust against, an even more satisfying smack ringing out with each impact. For a long time the only sound to be heard was the constant slap of flesh on flesh and their collective moans and groans filling the room.

She came on his dick over and over, crying out lyrically each time, and he loved it and kept on fucking her, wanting to hear more, to feel more, as he built to his own climax. "Just like that," his mom began to say, just as he thought some dirty talk would be nice. "Fuck your mommy, fuck me, fuck me so hard, harder you stud of a son. Fuck me with the dick I made. This pussy is yours, this body is yours. Fuck me hard, just like you want. AHHHH!!!" she cried as she came again.

He nearly came with her this time, but she knew he wanted to hold out a little longer and flipped them over again so she was on top again, fully impaled on him, grinding herself slowly to keep him on edge. "Just like that. You can have me whenever you want. Want me in the kitchen while your father watches? Maybe with your aunt as we share your big dick? If you want I can call all my good-looking friends, and you can have them too, just like with me," his mom said while grinding on him. "Oh, you want to fuck your sister too. Maybe fuck us together as twins? You can fuck all the pretty girls in your school," she added, pulling up and trusting on him hard. "All the girls in town," another thrust. "all the mothers in town, anyone you want. You could have some guys fuck some girls so you can watch your own personal live porn. You can have them fuck all the girls all the time just so you can get off watching them," thrust again. "You want to cum in me," she began thrusting faster. "Don't worry about getting me pregnant, I know you don't want that. I'll only get pregnant if you want. Cum in me son." He felt his dick tensing inside her, felt her climbing up another peak. "Cum in your mother's tight pussy! Fill me with your spunk!!!" She yelled and he came hard inside her, filling her cunt. She came explosively again on his hard dick, their mutual orgasms building to crescendo of sexual pleasure.

She collapsed on top of him, breasts puddling on his chests, both breathing hard. After a few seconds, she sighed and slowly pulled herself off of him, his dick sliding our of her. A giant puddle of their combined juices was let loose, and for a second John thought about how icky it was, now that they were done, and then suddenly it all evaporated. They lay there, side by side, John idly watching her boobs rise and fall, as she breathed deeply to let him.