Chapter 4
Jack opened up the app on his Dad's phone once more. He flipped it to his Mum's profile and checked her stats. As he suspected, her "desire" level had risen of its own accord and she was now well above 200%.
As he looked up, Kate caught his eye, giggled, then licked her lips seductively and made a show of pushing her fingers gratuitously between her legs. "Doncha wanna fill Mummy up again?" she purred then let out a long moan as her digits made contact with the right spot.
Jack realised that with his parents in this state, they would need to get to work if they were going to get the place a little tidier before his sister arrived tomorrow. Before that, they would probably need to try to fulfil his Mother's seemingly insatiable needs.
Of course, dialling her desire down was an option, but it didn't seem to stay down for long. Plus, where was the fun in that?
He decided to risk giving himself a little desire boost so that he could keep up with his overtly horny parents. His swelling cock instantly drew Kate's attention and she strutted up to him, hips swaying.
"Looks like he's more than ready!" Kate chirped with delight. She turned and backed up against her son, wantonly grinding her butt against his erection.
Jack's knees weakened a little and he stumbled backwards into the lounge chair behind him. Kate fell back onto him, laughing. Suddenly, she fell silent, then looked back at Jack.
"Ooooh, Jacky wants to try that hole does he?" she teased, smiling broadly. Using the chair arms for support, she lifted herself slightly and manoeuvred herself into position.
Jack couldn't believe the ease with which she took him into her arsehole. The tightness was heaven on his aching dick. Kate was also having a revelation. She'd tried butt stuff with her husband and with boyfriends before that, but never remembered it being this good.
The thought of letting other guys use her arse made her shake with pleasure. She started rocking her hips and releasing a set of pornographic noises. At one point Jack heard her utter, "Mmm, feels so good in Mummy's butt!"
This action had peaked John's interest. The sight of his wife impaling herself anally on their son's cock was sending a tingle through him. He left his place at the table and stood over his wife, uncouthly grabbing a handful of one of her inflated tits in one hand.
Through the blissful haze, the sight of his Neanderthal-level Dad getting worked up reminded Jack that he could help things along here. He still had the phone in his hand and with some concentration managed to open his Dad's profile. He pushed his thumb onto the "desire" slider, just as his mother clenched his cock tightly in a pre-orgasmic spasm.
Jack managed to give his Dad the boost he aimed for. His giant vieny dick rose instantly to full attention making Kate squeal with delight. "Do it babe!" she demanded over and over.
The phone slipped from Jack's hand and it landed just out of his reach. However, he could see that the long press he'd accidentally given the screen before dropping it had opened up a whole load of new menus. With his mother writhing around on his cock, Jack was in no position to find out if he'd changed any of these new settings.
"For fucks sake Dad, she wants you to fuck her too!" Jack shouted, snapping John out of his titnosis trance. He grunted with realisation and slowly moved into position.
"Fuck yes, I want both my boys in me.... Stretch my holes.... Fill me up..." Kate screamed, watching as her husband forced his wide throbbing pole into her cunt. This was beyond anything she'd felt before and her first orgasm hit instantly.
John had only just got started, pumping his dick in and out of his wife like a machine. Kate, still cumming hard, was shaking uncontrollably, clamping Jack like a vice. Jack knew he wasn't going to be able to last much longer either.
John, between grunts of pleasure, chuckled. "Kate's such a fuck slut!" he droned, loving the way his wife had demanded he and his son use her. It was a dream come true and he could feel the surge of another orgasm building.