After the dinner Heather noticed that John didn't feel well and asked if he wanted to some cheering up while she puts the boys to sleep. John took the hint and went straight to the bedroom to wait for her. Simon and Ed had other plans in mind. They knew that the computer room was off-limits but as Ed distracting their mother. Simon pickpocketed the key. Both pretending to go to sleep while they knew that their parents would be busy all night. The moment Heather left the room and closed the door. Both, Simon and Ed, quietly tiptoped to the study room's door and opened it. They saw the chronivac running as it's blue and gray screen illuminated the dark room.
"I think we should do this quickly." Ed shily wimpered.
"Yeah, yeah. Mommy's always playing with her computer so now's the best time to... Wait a minute? It's not a game. It's some kind of weird app with texts and numbers." Simon
While Simon and Ed begun to fiddle with the computer. Heather was full swing at pleasuring her husband with every skill she had under belt. Making sure the John felt loved she did everything to pleasure her husband with all sorts of tricks. John was ready to mount Heather as two of them went with a doggystyle.
On the computer room Simon was already starting to understand how use the chronivac and giggled that they should make their mother younger. Ed, who was better at math, told his brother if he should make sure that they wouldn't get any younger first so that they wont disappear. Simon snapped his fingers and made changes to their profiles to have a 'shield' or a bubble that wouldn't affect them as they made changes to the machine. Then Simon slowly begun to make her mother younger with a slider turning the already young mother younger.
23... 22... 21...
"Oh no! What's going on? Am I shrinking?" Heather thought while she was penetrated by John's growing cock. "I'm... Ah... Ah... I just... Fuck-fuck-fuck. His cock is getting bigger and massive inside me. I- I- I have to do something before it's..."
20... 19... 18...
Heather age was melting like a butter in pan as the years started to skim off from her body. She was getting younger and younger as John stayed the same age. Heather could only pant and heave heavily as John was using her like a fleshlight as Heather had become lighter and more petite compared to him. John's big muscular arms and biceps sticking to her hips like two big clamps. His grip strenght sent Heather flying in front and back motion like a gun that was getting load with the same bullet. Heather had hard time to think as every pull made her more relaxed and the mind go all fuzzy. She was sticking her tongue out while making lewd noises, moans and coughs with her throat and lips. John begun to get more aggressive as Heather's pussy got smaller. He had never felt something so tight and warm before. Heather's brain was frying at John's hands as she was used like a sex toy. John spun to a missionary position to face him and gave her a big wet smootch with tongue action.
Heather had hard time thinking as the 9 or 10 inch sausage was penetrating her. Her brain itching for more and more until she had an orgasm and let out her lady juices on John's cock. Dripping down like a stream of water straight to the bedsheets. Suddenly Heather was lifted and spun again in 180 degree angle. John was stanging while Heather was placed on the bed on her stomach. John was pushing and pulling Heather by her thighs producing audible splatting like a big spoon hitting warm pool sized porridge bowl. After two or three orgasms that followed Heather's mind was getting clearer.
"What just happened. How I'm so thin and... fuuuuck!" Heather thought as John was pushing her hard cock deep inside her. Pressing his cock deep inside her womb. Heather panicked if the chronivac had gone rogue but she couldn't move as John took her into a suplex grip by the neck and begun to fuck her even faster and harder. The room was echoing in her moans that she couldn't control and droop that followed them as the big chunks of spit burseted out of the mouth. Heather silently prayed that she wouldn't get anymore younger than this while she had her fourth orgasm. Making her eyes water and form vertical line out of happiness as she murmured and moaned for more sex.
Inside the computer room the chronivac was displaying an error message with flashing yellow warning sign with black and red text. It explained with bullet points that there would be big, world changing, alterations happening if the age of [Heather] was lowered even further. Boys looked at the warning and Simon turned to face Ed to ask his opinion what he wanted to do. Telling him that they would be safe even if they kept going.