A fucked up family dynamic

You slid down against the side of the hallway, straining against the urge to sleep or somehow find a way to knock yourself the fuck out. You would've asked your grandmother for help but, from the way she was laying spread-eagle and barely alive, cum pooling underneath her body and leaking from all three holes, she wouldn't be of any help for at least a few more hours.

She was perhaps the longest in duration, the one that had the least amount of necessary contact, but that came with a price. The woman's body was perfectly synced with your body, like it was designed to be its receptacle and with every output your cock made, her pussy was equally up to the task of intaking it. She had been insatiable on the best of times but that was before you had received the first dosage and your load count soaring caused her body to go into overdrive. You had only really heard of the term "fucked senseless" before used in some random hentai or bad porn story. Now, looking at the way your grandmother had her tongue hanging out of her mouth and the way her eyes were glazed over and dazed, you weren't so sure that you could do anything else.

"Fuckin' hell..." you muttered, finding some energy to stagger to your feet and with barely enough energy, you slipped on your pants, tucked in your shirt, and got your shoes on. You didn't even bat an eye to realize that it took you an hour to do so. By the time you got to the car, your body and spirit were weakened by the tremendous fucking you were doing that day. Your cock, though, perfectly fine. If there was ever a time to hate it...well..

"Yeah?"

"Listen...it's me." You closed your eyes at that sound and then took a few deep breaths. "I need you to do me a big favor."

"If it involves fucking or sucking or anything fap-related, you can go fucking die."

There was a pause and a laugh in the back ground before the voice continued. "No...it's not that...I need you to come home, quickly."

You paused at that. Normally, you would've chewed out anyone calling your house "home", especially since you lived alone. Though, with present company accounted for, that was not really the case now, was it. "What's going on?"

"It's Samantha and Kayla. They've fucking changed."

"So?"

Your mother's voice came over irritated and annoyed. "Listen, drop the hurt shit, and pick up your fucking nuts, okay? They're changing right now. You know what that means."

You did and after bemoaning the sorry state of your testicles, you hung up and turned the car onto the main highway and headed in the direction of your home. It took a few more moments before you got the courage to get up and when you entered in the house, you spotted your mom looking at you with both a look of relief and a look of trepidation. "Listen, before you..."

"Who they fuck and why they fuck is not any of my business." You saw the pain in her eyes at your words but you didn't even want to pretend that there was another reason either of them were in your house at the moment. "Now, what the hell is going on?"

She decided instead of talking to you to show you and she pulled you into the bedroom.