David watched with a special thrill as his girlfriend Sheila sucked his cock. She was so good at it, it was frankly incredible! It was like she knew his dick inside and out - which was because she did...
David couldn't take it anymore and felt his orgasm approaching. His eyelids fluttered and he leaned his head back, and it would've been obvious to Sheila what was coming if she just looked up. Sheila was too lost in the moment though, and David's hand on the back of her head meant she wasn't going anywhere anyways.
Sheila kicked her feet and squirmed as hot jism suddenly filled her mouth. She nearly gagged, but against David's firm grim she had nowhere to go. Some of it sputtered down onto her chin, but far more than that she swallowed.
"Asshole." Sheila muttered when David finally let her go. "I told you not to do that to me again!"
"Oh come on, I know firsthand that you think it's pretty hot when a guy surprises a girl by cumming in her mouth." David chuckled, wondering how he'd feel if it had been done to him...
It wasn't just a theoretical quandry he had to wonder about though, because it had been done to him. Just now. Sheila wasn't actually currently his girlfriend Sheila. Sheila was David. Also David.
"Well without warning it mostly just maked me hack and cough - so not fun from this side!" Sheila-David complained.
"Come on, you're sucking our cock more than the real Sheila ever did and you know it! You gotta indulge me every now and then! I know just how excited you are to be in that body..."
===
That was because up until two weeks ago, both Davids had been just the one David. David and his girlfriend Sheila volunteered for an experimental mind-swapping trial. The idea that they'd both be in each other's bodies had been a super-turn-on for both of them. David wasn't crazy about the idea of sucking cocks in general, but sucking his own cock? That was pretty exciting to him. And the idea of being able to play with Sheila's tits and pussy whenever he wanted to... Well, from how loud Sheila moaned when they had sex, he was pretty sure it would feel incredible!
But then they went to the trial and sat in the machine and sparks flew everywhere and there was a bright flash and then - David was still David. "It worked!" 'Sheila' had shouted and started grabbing her boobs uncharacteristically, leaving David very confused. When 'Sheila' said she was also David, the real David - and the technician who'd 'swapped' them - had been very confused.
It turned out something had gone wrong during the procedure. Some part of Sheila's consciousness had gotten scrambled and the machine attempted an automatic repair. In that moment, it had send David's consciousness back to his own body - BUT something had gotten fritzed and so a copy of David had ended up in Sheila's body anyways!
The technician's boss promised them that Sheila's consciousness was in storage and perfectly OK, only... it needed to undergo a complete defragmentation before it could properly be put back in her body. That was a process which might take months. The company running the experiment didn't want this bad news going around, so they promised David - and David-Sheila - a whopping fifty thousand dollars to keep it a secret while they fixed Sheila's consciousness. That meant that David-Sheila was stuck pretending to be Sheila!
===
David-Sheila wiped some of the cum off her chin and resisted the urge to eat it. Though it was annoying to admit; David-David was correct that even though it had made her gag a little, him cumming down her throat without warning had gotten her pretty hot! David had been pretty excited about the idea of being in Sheila's body and it hadn't disappointed! Everything felt so good, and sucking his old cock worked him up like nothing else!
The problem was David-David, who David-Sheila decided was probably a bit jealous. After all, everything she had, he had been denied. He was stuck with the same old orgams, the same old lack of boobs, the same old never sucking cock... She honestly felt kind of bad for him for missing out - not that in the long run that would mean anything. The technician had said that they'd be able to stitch their consciouses back together, so when there was just one David again he'd have all the memories of both of them.
"At least fuck me properly." David-Sheila pumped her old cock, trying to coax it back to life.
"So demanding. We're such a little slut in that body!" David tittered. David-Sheila blushed, knowing it was true. Her blushing was a turn on for both of them. It didn't take much effort for David-David to be back at full steam.
Naked and bent over the couch, David-Sheila presented her dripping pussy to David-David as she had done many times before. She felt him move behind her, lining up...
And pressing forward right into the wrong hole!
"Hey- ow! Ahn! Ow! What're you-" David-Sheila protested in shock as her asshole stretched around her old cock. Anal was something the real Sheila would never let him do!
"Oh fuck! Sheila's ass is tight!" David-David groaned as he pushed himself all the way in. "I know you're curious what this would be like. I know you planned to ask Sheila to do it to you, that way you could try and convince her to let you to it to her when you swapped back." David knew because he'd had those thoughts back before the experiment.
"Yeah but- fuck! Ow! O-ooohh! What?!" David-Sheila was surprised to find that her old cock in her new ass was starting to feel good! It hurt, but it was that good kind of pain. She knew she was going to be sore after this. Hell, walking might be a challenge if it went on too long. That didn't mean she wanted him to stop though. "Oh, you're gonna fucking love remembering this!" She mewled, knowing she'd never convince David to stop even if she wanted to.
David-David just smiled. He was going to enjoy having himself as a girlfriend for the next few months...