Shelly couldn't believe it had gone this far and come to this. She was sitting in her living room watching her husband and a young woman they had just met making out on the sofa right next to her. David had expressed growing dissatisfaction with their sex life since before they got married. He had always seemed to want more sex and different kinds of sex than Shelly had been raised to think was normal. He had starting hinting and then asking directly for her to get breast implants. Finally, he told her that if she wouldn't give him what he wanted, he'd find someone else who would. Shelly thought this meant he was leaving her and begged him not to go. He told her he was bringing in someone to do what Shelly wouldn't. She loved him and wanted to make him happy but just could not bring herself to do the things David craved. This third person had just rung the doorbell.
Samantha, Sam for short, was a thick, peroxide blonde with the biggest tits Shelly had ever seen. They were mostly on display in the low-cut tent dress she wore. Sam gave Shelly the once over and rolled her eyes.
"I don't blame you, coming to me if this is what you've been begging for a little rub," Sam cooed. "I know you must be backed up, David. Let me unload those balls of yours."
Shelly couldn't believe what she was hearing. David had found Sam online somewhere and had never met her in person before this moment. Sam turned to Shelly and shook her head.
"Hey, Flatsy, pay attention and learn how a woman pleases a man. It helps to have the right equipment, which I do and you, sadly, do not."
Sam was talking to Shelly, but walking over to David with whom she had locked eyes from the moment she arrived. Sam stood a foot from David and reached into her dress and scooped out one of her mammoth mammaries. She held it as an offering to David. She rubbed it and shook it and pinched the sizable nipple which grew longer, thicker, and darker. David leaned down to place his open mouth over the teat and sucked it hard. Sam shuddered a little and then purred.
"Oh, David likes to play a little rough? Me too," Sam said lifting the other massive jug out into sight. She cupped each one in a hand, barely containing the twin masses. She bounced and jiggled them. Then she lifted each heavy jug by the nipple and shook them hard. Then she dropped them, bent slightly so they hung from her chest unsupported and she slapped and spanked them hard for thirty seconds.
David moved closer and lifted first one, then the other great, big tit to his lips. He sucked and bit and chewed on the nipples and squeezed each impossibly big tit, burying his face in the soft masses. Shelly was frozen as she watched. This was nothing she was prepared for. It was so dirty and offensive, so nasty. This wasn't love.
"Let's see how he likes Sam's big, fat titties, ok?"
Sam knelt in front of David and rubbed the obvious bulge in his jeans. She undid his belt, unbuttoned and unzipped the jeans, pulled them down, and then rubbed his cock through his bulging boxer briefs. One quick tug and his fully erect cock sprang into view and into Sam's hand. She paused to lick first one palm and then the other and she stroked David's eight-inch cock expertly, making him moan and making Shelly begin to quiver.
Sam helped David step out of his jeans and underwear and sat him on the edge of the bed. She motioned for Shelly to come stand close by and Shelly obeyed her. Sam put on a display of the cock sucking art that dazzled both David and Shelly. David had been blown before plenty of times, but not by an expert who clearly loved what she was doing. Sam licked up and down the thick shaft, all around the bulbous head and then moved down to David's balls. She made sure that Shelly could see as Sam rolled her head back and took both of his balls into her mouth and gave them a tongue bath. David moaned and shook. Shelly realized that she was crying, but could also feel the warmth and wetness growing between her legs. Sam moved around to the side and after a few preliminary licks, plunged down fully deep-throating the large cock. Sams lips were against David's body. Her tongue snaked out and licked his ball sac. She unhurriedly began to pump her mouth up and down the full length of the cock while swiveling her head side to side. She noisily slurped the thick saliva drawn up from her throat by the cock-head.
Sam's hands weren't idle either. She reached around to knead and massage David's muscular ass as she sucked his cock expertly. She even traced a finger down the cleft between his cheeks, across his tight rosebud asshole. Sam knew David would explode in a second if she didn't act.
She pulled away from David and looked at Shelly, who was sobbing and shaking. Shelly looked at Sam's smiling face, her lips and chin dripping with thick drool and pre-cum. It dripped onto the vast expanse of Sam's huge tits, most into the chasm between them, but some dripping down to her sizable nipples and hanging from them like icicles.
Her bra and dress long discarded, Sam said to David (while looking straight at Shelly), "Here's something only a real woman can do. A no-tit flat-as-a-board little boy/girl can't give a man what every man wants. Every man loves to see a nice big, round pair of tits like mine. He imagines sucking them like your man loves to do so much. It's made his cock so much harder than you ever have."
Sam took hold of her huge tits and moved to encircle David's cock between them and began to tit-fuck him. Sam purred. David moaned and babbled about how he had dreamed of doing this, how he had jacked off to porn scenes of this, how Shelly could never do this. Shelly could never make him feel this good, he grunted, his orgasm upon him suddenly.
Even as David's wad was about to explode, Sam said to Shelly, even as she pumped her massive jugs up and down her husband's cock, "You see how a fucking woman pleases a man? You've never come close. And never will. I'm gonna drain your man's balls and make him my man. You just live here. David's cock is mine now."
And a geyser of cum arced from his cock more than two feet and splattered on the kneeling Shelly's face. But Sam wasn't giving away another drop. She sucked and swallowed a few big spurts of cum and then let the rest shoot onto her tits. David slumped back, exhausted. Sam moved away from him and leaned against the bed.
"Hey, you. Come lick your husband's spunk from my big titties. Eat it up."
Shelly looked down at her top stained with spots of jism and shook her head.
Sam turned to David, "Look, I'm happy to move in or just swing by whenever, but if this frigid bitch doesn't do everything I tell her to, I'm out. I'm gonna go clean up. When I get back, let me know."
David looked at Shelly and Shelly looked up at him. Through tears she begged him to stop all this. She pleaded to have her old life back, to make Sam go away. David didn't pause in firing back. Shelly had signed a pre-nup. He reminded her that she is broke without him. Homeless. In debt. The deal was simple. Obey Sam whatever that entailed or hit the streets.
Sam came back in wearing Shelly's bathrobe. "Well?"
Shelly stood in front of Sam looking down. Sam put a finger under Shelly's chin and lifted her head so they were eye to eye.
Shelly said, "I have no choice but to do whatever you tell me."
Sam snapped back, "Not good enough. Tell me you will do everything I tell you."
Shelly choked back tears and said, "I'll do everything you tell me."
Sam smiled and said, "Better."
Later that night, Sam began to push the limits. She and David had been kissing and petting and holding each other in prelude to another hard fuck, no doubt. Shelly had been standing in the corner watching them, wishing it was her being touched. Sam got up and walked over to Shelly. Shelly was in her sweats. Sam was nude.
