A few days passed and Hal was once again seated at the kitchen table, sipping some coffee and reflecting on all that had occurred that week. He couldn't sugar-coat it, the past three days had been difficult, to say the least.
That first day and night had been the worst. Walking in on his wife, Carol, getting fucked by their 18-year-old son, Gavin, was easily the most shocking and disturbing event of his life. The side-effect of Gavin's new depression medication had lasted for a full eight hours that day, turning him into a sex-crazed beast of a man who relentless fucked his own mother for the duration. Carol had practically limped into bed that night, having endured their son's non-stop pounding and fulfilling his every lust-fueled desire.
Hal hadn't asked Carol to confirm it, but from the noises they were making he'd counted three more loads of cum from Gavin before he was fully sated. And though he didn't exactly blame her, he was sure that he'd heard her have twice that many more orgasms during the ordeal. Son or not, he had fucked her good.
The morning of day two had literally been a night-and-day difference. When Gavin finally awoke, he had seemingly overcome the drug's nasty side-effect and it was now having its intended effect. Gavin was cheerful, talkative, and full of his old joy: a far cry from how he'd been during nearly a year in depression's cold grip. He was polite, helpful, and made them all laugh the way he always used to.
When asked, he told Hal and Carol that he had no memory of the latter half of the previous day and had assumed the medication had conked him out. Pressed, he said he had a very vague recollection of mom helping him with something, but he couldn't remember what.
"And that's how it's going to stay," said Carol to Hal, steadfastly. Gavin had just left to take a jog, something he hadn't done in months, giving Hal and his wife some time to debrief.
"I mean, some part of him HAS to know though, right?" said Hal, though even as he said it he doubted his words. He'd watched Gavin intently during their conversation, and there was no hint of a lie when he said he couldn't remember. No inkling of an idea that he'd spent half the prior day fucking his own mom.
Carol shook her head.
"He doesn't, and I don't like keeping it from him but it's for the best. Look how well the meds are working now. He's back to being himself. The hyper-virility is... intense... but if this is the payoff it's worth it, and he'd never keep taking the pills if he knew they made him... do... me," said Carol, choosing her words carefully.
Hal's possessive side wanted to disagree, still harboring some anger that his wife had and might continue to fuck someone else (their own son at that) but at the same time he had to agree with what she said. This past year had been hard on all of them, Gavin most of all. If these new meds gave them their son back then, well, maybe it was worth Carol getting her brains humped out on occasion.
And so around midday on day two when the time came for Gavin to take his next round of pills, both parents were in alignment. As expected, the side-effect had kicked in again and turned him into a raging sex beast. But instead of letting him overwhelm her, Carol simply lead him to his room and spent the next several hours... taking care of it. It was every bit as intense as the previous day, but Carol had discovered that the more accepting she was, the more willing or even eager that she could appear to him, the easier he was to handle. He was less rough, less wordlessly demanding. He was still practically an animal, but not quite as untamed.
Hal mostly tried to stay away from Gavin's room that day, though more than a few times during their nearly six-hour long fuck session his curiosity got the better of him and he took a peek.
What he saw was different each time, but with the same familiar theme of his son pounding the ever-loving shit out of his wife. Sometimes she'd be bent over the bed, getting backshots with her face buried in a pillow, screaming her way through an intense orgasm, her big ass rippling from the constant, heavy impact of Gavin's pelvis. Sometimes she'd be on her back, Gavin straddling her chest as he fucked her wobbling tits or slapped his sweaty cock on her face. Hal hadn't seen it, but according to Carol their son had more than once tried to squeeze his fat cock into her asshole, nearly succeeding if not for her redirecting him to a different hole. Carol didn't even do much anal with her husband's average-sized dick; he didn't even want to think about what their son's meaty dong would do to her tiny hole.
That second day, while his wife repeatedly drained their son, Hal had spent some time online researching this drug Gavin was on. Everything he found confirmed what he'd been told about it: in some male patients, it could induce intense sexual arousal often coupled with short-term memory loss. He found numerous reports of users who had felt compelled to masturbate half a dozen times or more when the pills kicked in, and even cases of guys who had intense sexual encounters with their wives or girlfriends while remembering little to none of it. Hal had found no mention, however, of a user being so horny that they'd fucked their own mother, but to be fair, who would share that kind of thing?
Day three was more of the same, with Gavin being delightfully happy and blissfully unaware of his repeated incestual activity. He took his medication around midday and kept his mom busy until just before dinner at 5:30. Carol found her rhythm that day, her body not only adjusting to the size of her son's cock (somewhat) but really starting to understand what he wanted in his sexual fugue state.
"The first couple of loads come pretty quick," she had told her Husband that evening, "He gets impatient during handjobs but if I use my mouth I can usually get him to cum twice and avoid some of the initial roughness. After that, he's pretty insistent about getting into my pussy, but if I'm an active participant he's a lot less violent during it. Also, he seems to like hearing me talk, so I've used that a few times to get him off more efficiently."
Hal listened intently, like his wife was sharing a story of a problem she'd solved at work.
"What kinds of things do you say?" said Hal. He often heard her muffled voice coming from Gavin's room, but hadn't heard any of the words.
Carol's cheeks flushed.
"It's... it's a little embarrassing..." she said, shifting a little.
"More embarrassing than having to putz around the house while your son tries to nail your wife to his mattress with his cock?" asked Hal, not angry but not in the mood for Carol to suddenly put such a high value on discretion.
"Fine, fair enough," said Carol, taking a deep breath.
She told him that, in his hyper-virile state, Gavin seemed to like hearing her give him direction. Specifically, things like "fuck me harder" or "let me suck it" not only made him more pliable but also made him reach orgasm faster. She added, a hint of a blush coming to her face, that some aspect of their mother/son relationship also seemed to appeal to him.
"What do you mean?" asked Hal, curious.
"Well...," said Carol, taking a long pause, "I get a stronger reaction if I call myself 'Mommy' when I give him direction. Like 'Put it in Mommy's mouth' or 'Fuck Mommy harder'. It was pretty awkward for me at first, but it really seems to do the trick."
