After his initial treatment to boost his masculine qualities, Eric was scheduled to return to the clinic every 2 weeks for follow-up. Every day, he looked in the mirror for a more chiseled jaw and tested out for a deeper voice, but found neither. He knew he had to be patient, but so far the only thing he felt was a strange sensation in his lower abdomen. At the first 2 week check in, Dr. Andrews reminded him not to expect sudden changes. The important thing was that there were no serious negative effects.
Eric's son Josh was making the most of being 18 and on summer break before college. He was life-guarding at the community pool during the day, going out with friends at night, and keeping up with his own swim routine in their backyard pool.
One Saturday afternoon, about three weeks after his first treatment, Eric heard his son shouting for a towel from the pool. About once a week Josh forgot to grab one before diving in, and he knew he'd get a lecture if he came in dripping wet. Eric sighed and grabbed a towel and met Josh as he emerged from the pool.
Seeing Josh's wet body in his tight speedo, Eric nearly lost his breath. He had seen his son like this hundreds of times, so why was he suddenly a deer in the headlights? From the playful mop of head on his hair, to his killer smile, and defined abs with just the faintest hint of blonde body hair, Josh's tan body glimmered in the sun as a tingly heat raced through Eric's body.
"Dad, the towel?"
Eric suddenly snapped back to reality and realized he had a white knuckle grip on the bright yellow towel in his hands. He handed it over to Josh, and wondered what came over him. Was this a reaction to the treatment? Was his body just overly confused? It seemed to have passed so Eric shrugged it off.
Two days later, Eric was doing Josh's laundry when he found by-now-typical jerk-off socks cleverly hidden, folded up in a t-shirt. Eric rolled his eyes before suddenly being overcome by another flash of heat. Before he knew it, the scent of his son's cum was filling his nose as he inhaled the socks deeply to his face. But a moment later, he recoiled in horror at what he had done and dropped them into the machine, trying to forget what he had just done.
That night, Josh had gone out and Eric decided to polish off a bottle of wine in the fridge while watching something new on streaming. The show he turned to had a surprisingly racy plot and between the rampant sex scenes and several glasses of wine in him, Eric hastily retreated to his bedroom and laptop. He browsed a few porn sites until he found something to really get him going: a gangbang scene with 10 guys with at least 8" cocks pounding one petite "college coed." As Eric stroked his disappointingly-still-5" cock, he closed his eyes and let his fantasies run wild. But instead of being one of the chiseled men thrusting away, he was that girl taking 10 big dicks. He opened his eyes in confusion.
Although he often enjoyed this kind of porn, he never imagined himself as the one getting fucked. Not the least of which by a guy. But even his ass seemed intrigued by the idea, quivering and seeming... empty and hungry. Remembering that his ex-wife had left their pegging supplies behind, he rummaged in the back of the closet for the dusty box. He hadn't touched the stuff since she left so many years ago, but as he opened the dusty box he could not stop himself from admiring the several phalluses it contained. Eric took one of them back to his bed and slowly teased his hole before inching it inside.
Despite having taken the silicone cock inside him several times before, this time felt different. It was no longer just an enjoyable sensation, but instead a desperate need to be filled. Eric increased his insertion speed until he was fucking himself with nearly manic energy. His cock bounced rock hard before exploding on his chest without even being touched. As he came down from the best orgasm he had in... forever?... Eric knew something was different. And not just because he was still rock hard with an 8" dildo in his ass.
A text notification went off, Josh was on his way home, so Eric hurried to shower and put away the toy, though this time it went into the drawer next to the bed not a box in the closet.
Eric was dressed and downstairs just as Josh walked in the door. Eric could tell something was wrong immediately, but since Josh seemed uninteresting in talking, Eric did not push and instead offered him some ice cream and movie time. Josh turned on the TV and it came to life, resuming the sex scene from the show Eric had paused to go take care of his needs in the bedroom. Josh turned to Eric with a smirk on his face while Eric turned several shades of red.
Eric ran to grab the remote but Josh held it tight and teased him: "but dad, I want to see how it ends!" As Josh got up to play keep-away with the remote Eric played along and tried to grab the remote, but Josh was too quick. Then Eric tripped over the shoes Josh left on the floor and took both of them down on top of each other on the couch. Eric felt a flash of heat so intense he thought he surely would burn the various points of contact where father and son skin's touched on their arms, legs, and cheeks. Eric, without thinking, took a big inhale of his son's teenage scent, smelling the hint of chlorine from the pool and so much more. Realizing what he had done, Eric jumped up in shame, while Josh looked at him confusedly and said "oh do I stink?" and sniffed his armpits.
As Josh went to go shower, Eric drank several glasses of ice cold water and tried to control himself. He told himself it was clearly the treatment working and Dr. Andrews had said his body could respond in all kinds of confusing ways with the new hormonal changes and this clearly was just part of it. In fact, Eric decided to look at it as a positive thing showing he had progressed and the treatment to increase his masculinity was working. He would tell Dr. Andrews proudly. Dr. Andrews with the big biceps and uncommonly handsome smile. Who looked like he could pick up two Erics with ease and throw them on the bed and fuck them like an animal.
Eric felt two things at that moment: a rock hard erection in his pants and the strange quivering in his ass. As he quickly made his way to his room, he saw the bathroom door open with Josh's dirty clothes and wet towel laying on the floor. Without even thinking he grabbed Josh's boxer shorts and ran into his bedroom, closed the door, stripped down and jerked his cock while rubbing his teenage son's boxers all over his face, inhaling deeply, as his second load of the day painted his chest. Before he even had time to come down fully, he heard a knock at the door.
"Dad can I come in?"
Eric scrambled to wipe his load off himself with his discarded clothes and dove under the covers to hide his nakedness.
