Vern reaches between his legs, and tugs on the deflated canine dildo just sticking out from his pussy. Vern stood up, and cleaned himself and the dildo, before stepping out and drying off. Vern looked in the mirror above the sink and saw himself, but with very little stubble. Vern felt the urge, and sat down to pee on the toilet. Vern sighed deeply, not happy with losing his manhood, but knowing this is better than before. Vern finishes up, cleans himself, and stands. Vern flushes, washes his hands, and then just stands naked in front of the mirror.
"Damn," he thought to himself. His nipples were larger, darker, and completely free of chest hair. According to the instructions, the changes will continue to adjust his body to take full benefit of the canine dildo or actual canine cock, because he spent so much time with the dildo's change activator, proximity to canines, females in particular while knotted. It's not clear how much will change, but Vern knows to "pause" the changes, it will take an actual canine to make it happen. Vern also knows if allowed to continue, he will go into heat. Vern returns to Jake and the instructions one last time, making sure he didn't skip or misunderstand. Jake's an older dog, but Vern's smell is different. Jake hops onto the floor and goes over to sniff between his master's legs. Vern puts the instructions away, and the sane part of his mind says this is not happening, but he has to try something to halt the changes.
Vern slowly kneels down on the floor and onto his hands and knees, allowing Jake to have full access. Jake takes his time sniffing and licking at Vern's canine pussy, working both of them up. Vern waits for Jake to mount him, as he also continues to talk himself out of letting this happen. Jake notices his master's pussy has a stronger taste with each lick, his own cock throbbing and ready. Jake sits then jumps slightly to get his front paws on Vern's back, before poking around in vain to line up with his master's pussy. Vern feels Jake get close, and reaches down to help the old boy aim, and the next thrust is deep, paydirt. Jake starts to piston in and out rapidly, and in a couple of minutes, Jake's knot pops and swells while erupting into Vern's pussy. Vern felt a little disappointment that he didn't get to achieve orgasm, but if the instructions are right, this will halt the changes until the next time Vern wears the knotted dildo inside him around the dogs. Jake did his job, and Vern pushed and squeezed on the swollen knot inside him to keep him hard and throbbing as long as possible. Jake's knot slowly shrank, despite Vern's best effort, and Jake withdrew his shrinking cock from Vern. Vern remained on his hands and knees on the floor. According to the instructions, the longer he went without using the dildo, the greater his need would become to be filled by it's fully swelled knot, or he could be filled by natural canine knot to satisfy the "itch" between his legs. Soon he had the urge to pee again, and Vern was once again sitting on the toilet to pee, with no pain or difficulty. Jake walks into the bathroom and looks up at Vern, where he notices that Jake's muzzle fur is now more black than white, and his one cloudy eye is now crystal clear.
Vern smiles to Jake and says aloud, "Your welcome. According to the instructions, we will gain more of our youth as we achieve orgasm with one another. I dare not say those instructions do not apply again."
Vern is reading a newspaper from two days ago when the phone rings. The biopsy preliminary report is back to the oncologist who did the procedure, it's cancer, and it's malignant. The tumor is likely already spread to other places. They want to schedule prostate removal tomorrow. The news is a shock but reasonable. Vern asks the woman on the phone that he would like a few days to think on it if that's ok. She agrees and Vern hangs up when she does. Vern has no plans to call back, as he not going to try radiation or chemo like his wife did. Vern goes in search of his coveralls, and once he finds and wears them, he takes Jake back to the kennels for the remainder of the day's training and feeding. Several hours later, the itch returns, and he just slips off his coveralls for Jake to mount, piston a few minutes, and knot up.
Jake joins Vern in coming in for the day. Vern slips off the coveralls, and stands before a mirror. Other than his cracked, wrinkled skin looking only slightly cracked, and most wrinkles are gone, he could pass for mid 50's. Vern finds it difficult to stay awake, and climbs into bed with Jake asleep on the floor.