I never meant for the chats to get that filthy. It started on a private forum where people swapped made-up stories about forbidden family hookups, all adults, all fantasy. I logged in as “TabooTease22” and posted a short one about a stepsister who couldn’t stop thinking about her brother’s cock after catching him jerking off. Within minutes, a user called “BigBroVibes” replied.
“Damn, that’s hot. Mind if I add to it? She’d slide into his room at night, whisper how wet the story made her, and beg him to read the next part out loud while she touched herself.”
I grinned at my screen. “Only if he grabs her wrist and makes her finish the story with his fingers inside her instead.”
The back-and-forth got dirtier fast. We built whole scenes: stolen glances at family dinners, secret phone calls where she described exactly how she wanted him to fuck her, the risk of getting caught making it hotter. Every night for two weeks we traded paragraphs, sometimes whole pages, role-playing the siblings who finally snapped and locked themselves in a bathroom during a party.
“Tell me what you’d do if it was real,” BigBroVibes typed one night.
“I’d let my brother bend me over the kitchen counter while everyone else watched TV in the next room,” I answered. “Quiet, desperate, his hand over my mouth so I wouldn’t moan too loud.”
He replied with a voice note. Low, rough, breathing heavy while he described pulling my hair and telling me I was his dirty little secret. I came listening to it, legs shaking, laptop balanced on my thighs.
We kept going. He started calling me “little sis” in the chats. I called him “big brother.” It felt safe because it was just words on a screen. Then one night he asked if I’d ever thought about meeting someone from the forum in real life.
“Only if they’re as filthy as you,” I typed back.
A week later we traded numbers. The first real call lasted three hours. We didn’t use our real names at first, just kept the fantasy going. He told me exactly how he’d eat my pussy while I read one of our stories aloud. I told him I’d ride him slow, clenching around him every time the story got to the part where the siblings got caught.
By the third call we were both admitting we were getting off to the idea that maybe, just maybe, the other person was actually into the same twisted shit we wrote about.
Then the slip happened.
I mentioned my hometown by accident. He went quiet for a second, then said, “No fucking way. I grew up twenty minutes from there.”
We compared details carefully, laughing nervously. Same high school. Same graduation year. Same family last name.
My stomach dropped. “Wait… is your name—”
He finished it for me.
It was my actual older brother. The one who’d moved two states away after college. The one I’d always had a stupid, secret crush on when we were teenagers.
Neither of us hung up. The line stayed open, breathing mixed with shaky laughs.
“So,” he said finally, voice low, “all those stories…”
“Yeah,” I whispered. “All of them.”
Silence stretched, thick and electric. Then he asked, soft and careful, “You still want to keep chatting like that?”
I swallowed. “Only if we can make one of them real.”
We met halfway, at a motel off the highway. No small talk. The second the door closed he had me against it, mouth on my neck, hands sliding under my skirt exactly the way we’d written it. We didn’t pretend it was anyone else. We said the words out loud.
“Little sis,” he groaned while I unzipped him.
“Big brother,” I answered, dropping to my knees the way the story had gone.
We fucked like we’d been edging for months, because we had. Slow and filthy one minute, hard and desperate the next. Every time one of us quoted a line from our chats the other came harder. He made me read the last story we’d written together while he was inside me, voice breaking every time he thrust deep.
Afterward we lay tangled, sweaty, grinning like idiots.
“Think we should post the real version?” he asked.
I laughed against his chest. “Only if we write the next chapter together first.”
We still chat every night. The stories are longer now, dirtier, and every single one ends the same way: with us finding each other again.
