Cindy was happy. Her stepbrother’s hand on her ass felt good as they walked through the mall. Her massive 34FF breasts bounced in her sweater; her short flirty skirt whispered against her tanned thighs.

She kept stealing glances at the impressive bulge in Tim’s tight jeans. God, she thought, he’s hung like a donkey!

She and her stepbrother Tim were spending the afternoon in a town far from home where nobody would recognize them. Here they could openly be a couple — a gorgeous, curvy woman and her handsome beau — and no one would suspect they were actually step-siblings with no blood relation. Cindy, sandy blonde, had just turned twenty-one; Tim was twenty-three.

Wherever they went, heads turned in their direction — or rather, in Cindy’s direction. It was obviously because of her enormous breasts. Cindy didn’t mind. She was used to the attention by now. She loved having huge tits. They gave her power; they let her have any man she wanted. But right now, the only man she wanted was her big-dicked stepbrother.

“Titsugar?” Tim asked, his hand half on her hip and half on her ass.

“Hmmm?”

“Want to shop for some tops?” He openly snickered at the immense expanse of sweater enveloping her flesh.

Cindy smiled, showing perfect white teeth. “You mean,” she teased, “I should try on some tops while you stare?”

“Well yeah, my love,” Tim smirked fiercely, squeezing her ass. “You know that’s what I mean.”

“While the salesgirls enviously watch my big tits?” beautiful Cindy asked sweetly. “And you stare at me in my short skirt and busting sweater, forever watching me in the store mirror for everything I try on?”

“Well yeah,” Tim whispered, “that’s exactly what I had in mind.” He leaned forward and kissed his gorgeous stepsister on the lips.

“Ooo, Tim,” Cindy teased blissfully. “Are you sure you should kiss me like that? I am your stepsister, after all.”

Tim quickly glanced around to see if anyone had overheard. He couldn’t be sure, but a nearby man wore a stunned expression and stared directly at them. Then again, Tim thought, maybe the poor guy had just noticed Cindy’s colossal tits for the first time.

Cindy didn’t seem worried about being heard. She rubbed his muscular chest through his shirt. “Alright, Bunsen-hose,” she said cheerfully, “let’s go shop for some tops.”

Bunsen-hose was one of her nicknames for him. Buns and hose. Cindy practically drooled every time she looked at her stepbrother’s muscular, rounded ass, and got wet just thinking about his thick “hose.”

The store they chose sold slinky clubwear and was called “Minx.” Behind the counter stood two cute, immaculate girls. Their eyes widened when they saw big-breasted Cindy. Tim stifled a laugh; it had just occurred to him that Cindy’s tits were bigger than their heads.

“Can we help you?” the cute brunette asked.

Cindy smiled sweetly. “I’m looking for a top.” She slipped out of Tim’s arm and approached them, her huge breasts bouncing slightly. “Something tight and low-cut.”

Forty-five minutes and two very flustered salesgirls later, Cindy and Tim emerged from the mall with their arms around each other again.

“Fuck me, Tim. I want you to fuck me,” Cindy whispered in his ear, her large firm breasts pressing against him. “It’s been weeks since we’ve been alone.”

“We have to head home in a couple hours. We promised Mom we’d be on time for dinner,” Tim said, serious despite his growing desire. He thought a moment, then asked: “Want to get a room for a quickie? We saw motels driving into town.”

Cindy rose on tiptoe and kissed him deeply. “Oh yes, baby. Let’s get a room.”

As soon as the motel door closed behind them, the step-siblings pounced on each other, desperate to undress and fuck. Time was short; foreplay was out of the question.

Cindy pushed away Tim’s groping, clumsy hands and peeled off her sweater, revealing a truly massive bra straining to contain her colossal mammaries. “Hurry, take off your pants,” she whispered.

She unbuttoned and quickly dropped her short skirt, stepped out of her thong, and tossed both aside. Tim had removed his jeans but briefly struggled to free his huge erection from his boxers.

Desperate, Cindy pushed him back onto the bed and grabbed his nine-inch cock, guiding it into her tight, dripping wet pussy.

“Fuck me, Tim. Fuck me, stepbrother. Fuck your stepsister raw.” The dirty words spilled from her mouth as the twenty-one-year-old’s FF-cup tits heaved and wobbled in her bra. She rode him hard, mounting him from above.

“God, Tim, your cock is so fucking huge.”

Tim gripped her ass as she bounced on his thick dick. He reached up and palmed her immense breasts, savoring their weight, firmness, staggering size. Christ, he thought, they’re like basketballs.

He was tempted to flip her over and fuck her properly, but knew from experience she could come faster like this.

“Ooo, Tim,” Cindy panted, her gargantuan bra-encased breasts bouncing wildly above him. “I love your huge cock. I love my stepbrother’s thick cock inside me. It’s so big… it’s so fucking big.”

She frantically writhed on his massive pole.

“Cindy, baby,” Tim exhaled, loving how her tight pussy gripped him. He thrust upward, driving his long, thick cock deep as she slid up and down.

The horny step-siblings fucked furiously like this for several minutes, their mounting ecstasy driving them wild. At times Tim strained to lean forward and bury his face in her enormous tits, and she’d grab the back of his head, mashing him against her soft, heavy breast pillows.

Their fucking continued. Tim sensed his stepsister was nearing her peak, and timed his own climax to match hers.

“Timmmmyyyyy… I’m comiiiiiing!!”

Tim let go, exploding inside his voluptuous stepsister, gripping her giant mountains as he fired thick gushers of cum deep into her convulsing pussy.

Cindy collapsed forward onto his chest, leaving a trail of breathless soft kisses on his neck and face.

Their special moment as lovers was over now. Time to return to that other world where everyone knew them only as step-siblings.

Tim held her close, her immense breasts pressing against him, swelling between the two blessed lovers.