"When I cum… things change."
This… sort of fills the prompt? Sorry, I got interested in one facet of the idea and started chasing it, and then didn’t really have space for the actual prompter’s fetish.
“Look, it’s not you, it’s… I’m just…”
Jen’s hand stopped, but she left it resting against Will’s rock-hard penis. She could feel its weight and heat through his boxers. “I know this is a little sudden, but Will, I really feel like it’s time we did it. I promise, I won’t judge anything that happens.” She stroked his cock gently, and was rewarded with it spasming and swelling even larger against her palm.
“But… I… alright.” He pulled down his underwear, revealing the full length of his twelve-inch monster. Jen let out a little breath, not realizing she’d been holding it in. She knew he was big, but to see it up close was another thing entirely!
She bent over and kissed its plum-sized head, then began licking and slurping over its length, her hands stroking his thighs. “Mmm, I just wish my boobs we big enough to give you a proper tit-job,” she murmured. She’d always been happy with her B-cups, but a cock like this practically begged to be sandwiched between a proper pair of boobs.
“I think your b-breasts are wonderful,” he said, his hand snaking down to tweak her nipple. She moaned, and moved her hands to massage his shaft as she continued working on the tip.
“Just let me know when you’re ready,” she said, “I want to make sure I get all of your cum.” She assumed he was close – he was rock-hard and his cock was almost straining to let fly, practically throbbing with arousal.
“Oh, uh, ugh, it’s happening!”
She clamped her lips closed over the slit and was rewarded with a massive wad shooting straight into her mouth, filling her up and bulging out her cheeks. Hastily, she swallowed, only to have it replaced with another shot, and another, and another, blast after blast of the creamiest, most delicious cum she could ever imagine existing. She slurped and sucked, unable to think about anything else, until his cock fell silent.
Giving one last massive gulp and clearing her mouth, she pulled away and sat up, smiling until she caught sight of Will’s face. “What? Did I spill some?”
“Your breasts!”
“What about them?” She reached up and cupped her massive L-cups, and smiled as she watched his eyes perfectly track her big fat nipples. “Did I get some cum on them?”
“Oh no, I knew this was a bad idea…” he turned away from her, head in his hands. Instantly, she was alongside him, hugging him, concerned.
“What’s wrong, honey? Don’t worry, you can tell me, no matter what it is. I completely trust you.”
“It’s my cum!”
“What about your cum?” She hadn’t noticed anything special outside of how good it tasted.
“When I cum… things change.”
“I don’t understand, Will. What changes?”
“It depends. Mostly whatever I’m fantasizing about. I wasn’t always packing like this, you know. My cock used to be normal, five inches. Then one day I was jerking off and though it’d be nice to be a little big bigger and bam, twelve inches of meat.”
Jen had no idea what to say. Her boyfriend apparently thought he had a… magic cock? “What changed this time?”
He turned to look at her in the eyes, his own slightly puffy and red. “Promise you won’t get mad?”
“Promise.”
“Your… your breasts.”
“What about them?”
“You were a normal B-cup, but now, they’re… so big…”
“I was a B-cup? But I haven’t been that small since middle school!”
“When I came, you changed, and your whole life changed. Your memories, everyone’s memories, everything is different.”
“Will, I…”
“I understand if you hate me, but I don’t think–”
“Will, I love my breasts!”
“–I… what?”
“I love being big! I can’t imagine ever being a B-cup!”
“But honey, that’s the change talking, not you!”
“Will, I’m sorry, that’s just bullshit. I am who I am, alright? And I, me, Jen, the person before you right now, loves having big breasts.”
“But–”
“And if you’re the one I have to thank for that, well…” she leaned in and kissed her confused boyfriend on the mouth. They made out for a minute, Jen making sure to press her big breasts up against his body. She finally came up for air. “In fact, if you find these sexy,” she said, noting that his cock was powering back up to full erection, “what else would you change about me?”
He pulled away from her. “Are you serious?”
“Dead serious. If you’ve got a magic cock that makes me into your dream woman, who am I to resist? C’mere, stud.” She pushed him down onto the mattress in his tiny studio apartment, and straddled him. “Wouldn’t it be sexy if we were both rich?”
“Jen…” Will’s face was hard to read. She could tell he was, indeed, turned on, but there was an undercurrent of fear there too.
“Trust me, magic man,” she cooed, sliding her slick folds along his shaft. “Imagine the two of us, but we’re both rich enough where we never have to work again, can just live in the city and be in love…” She could swear she could see something moving in her peripheral vision, but she concentrated on Will. He was already close to cumming, she could see it. “We’d have an apartment overlooking the park, a maid, always eat at the nicest restaurants…” She played with her breasts as she ground against him. “Imagine the two of us out on the town, me hanging off your arm, the paparazzi staring at my big tits wrapped in a slinky black dress, before we went to the opera…”
“Fuck!” Will shouted as his cock spasmed and he came, jizzing all over his abs in long, hot streaks. Jen kept grinding, attention fully focused on his cock. Finally, after the final spurt, she slid forward and lay her body against his, her big breasts sliding to both sides of his torso.
“Did it work?”
“Did what work?” Will was still panting, coming down from the orgasm currently squishing between their abdominals.
“Did whatever I was asking for, making you fantasize about, come true?”
Will blinked, and looked around. “Where are we?”
“Your apartment, silly!” Will’s apartment was amazing, a massive two-bedroom with sweeping views of the city. “Wait, is that what I asked you to change?”
“No, wait, yes… sort of.”
“Well, which is it?”
“It’s… money. You were telling me to make both of us rich.”
“But we’ve already got plenty of money! We both won the Powerball last year!”
“That’s what… that’s what changed. We both used to not be rich.”
“Oh, that’s clever of me!”
“This is weird, Jen.” Will gave her a little push, and she slid off him, dragging his ejaculate with her onto his sheets.
“This is awesome, I guess it worked!” Jen sat up and played with her breasts again, attempting to distract Will. “According to you, I was broke and flat when I woke up this morning, even if I don’t remember it, so I think this has been an excellent day.”
“But we’re messing with reality!”
“And has anything bad happened yet?”
“…no, I guess not…”
“Then don’t worry so much.” She stretched, and grinned as Will’s cock rocketed back up to full erection again as he watched her breasts shimmy. “Ooh, you’re not tired yet, are you!” She slid over next to him and ran her finger up his cock. A big fat drop of pre-cum appeared at the tip, which she licked off.
“You know, we haven’t properly fucked yet tonight, and I say we fix that.”
She lay back and spread her legs, her hand spreading her open. “Get over here, stud, and put that tool of yours to use.”
Will swallowed. “But what if–”
“Will, I completely trust you. No matter what happens to reality, I will always trust you to do the right thing. Now please, your girlfriend really, truly wants you to fuck her until she’s sore.”
Mercifully, Will didn’t say anything else, but simply shifted around and, with one aggressive thrust, impaled Jen on his rod.
“Oh yes!” She yelled out, as they began to pound away at each other in earnest. “Fuck me! Fuck me! Fill me up!”
“I love you!” Will found himself saying, as he thrust away.
“I love you!” Jen cried back, her whole body tingling with pleasure as his massive dick filled her up over and over again.
“Here it comes!” Will groaned, as he hilted himself inside her and started to erupt. Jen moaned in ecstasy as the two of them collapsed into each other’s arms and, with very little else to say, passed out for the night.
Jen woke up first, and disentangled herself from Will’s embrace. “I’m always the first one up these days,” she grumbled, hauling herself toward the bathroom.
After she was done, she stopped and examined herself in the mirror. A mess, she thought, but unsurprising considering how last night had ended. She idly swept a lock of hair behind her ear and stepped back into the bedroom, where Will had apparently finally woken up.
“Good morning, honey,” she said. “Did you sleep well?”
Will didn’t respond; instead, his jaw had dropped open as soon as he turned to look at her.
“What? Did I grow a third eye or something?”
She spun in place. Cute, smiling face: check. Big, firm breasts? double-check. Massive triplet-filled belly? check, check, check!
She scratched the underside of her giant womb and was rewarded with one of their daughters kicking back at her finger. God, she loved being pregnant. Everything about her was bigger and better: her boobs had gotten even bigger, her hair was shiny, her ass had gotten fatter, and even her big belly was strangely sexy, in her opinion. She felt like a goddess.
“Seriously, what is it?”
But she could see she wasn’t going to get an answer; for some reason, Will had fainted dead away.