Disclaimer: I do not own Modern Family and have no association with anyone involved in the show. I do not make any money from the writing of this story.
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Alex Dunphy was finally home after spending the entire day either in class or studying in the library. When she first got to college she had tried to study at home, but her girlfriend couldn't be trusted to keep her hands to herself, and to be fair even she, by far the more responsible adult of the two, just couldn't resist Haley when she was in full seductress mode.
That's why Alex was rushing to get home, because no matter how exhausted she was feeling now she knew all it would take was a few words from Haley, or just looking at that amazing girl she shouldn't be dating but was, and she would be filled with adrenaline, allowing the two Dunphy sisters to bang like bunnies. Just like they had been doing for years now.
It sounded like Haley had gotten a head start, which made Alex grin wickedly as she rushed through their home, but before she could say anything she found herself paralysed with mixed emotions as she walked in on her sister/girlfriend being butt fucked by their Mom. On the one hand Alex could feel her heart, and her entire being, shattering into pieces, as this was her greatest fears come true.
Not only was Haley cheating on her, but it was clear that someone else in their family knew their dirty little secret. On the other hand she had to wonder, was this her greatest fantasy come true? Had Haley really seduced their mother into having sex with them? Could that actually be possible?
For who knows how long Alex just stared at the sight in front of her, then suddenly she was noticed by her mother who froze and then gasped, "Alex?"
Which caused Haley to lift her head out of the bed sheets, turned to look at her and grin shamelessly, "Oh, hey baby. Mmmmm, don't just stand there, come and join the fun."
"Really?" Alex asked cautiously, but clearly eagerly.
"Oooooh yeah." Haley grinned, "Mom's a great fuck. Better than we ever dreamt. Mmmmm, and she just gave my little butt the most amazing fucking."
"Yeah, I saw." Alex couldn't resist grinning wickedly and looking her Mom up and down lustfully, "I guess you were right about her being a total top."
"Well, she needed a little push." Haley admitted, before grinning again, "But once she got going she totally wrecked my ass."
"Show me." Alex growled lustfully, "I want to see how good my Mom gaped my big sister's butt!"
With another wicked grin Haley pressed her face back down to the bed sheets and reached back to spread her cheeks. She then paused, giving Alex time to get beside their mother on the bed so she would have the best possible view of what came next. Alex hesitated a moment to do this as her Mom seemed frozen in time with a difficult to read expression on her face.
But after the last exchange, Alex decided her best course of action was just to show the older woman just how depraved they were, and hope it be enough to seduce her into joining them. The alternative at this point wasn't worth thinking about, and Alex now suspected that Haley had been right all along, all their mother needed was a push.
Typically Haley was only too happy to give her that, first by seducing her and now letting that big dildo slowly slid out of her widely stretched butt hole, Haley keeping her cheeks spreaded the entire time so that Alex and their Mom could have the best possible view. That was especially true when finally the last inch of the strap-on cock came out of Haley's butt, leaving a widely stretched crater where her little back hole should be.
Like before it made Alex insanely jealous. But also excited. She'd always seen gaping Haley as hot because it was revenge for being forced to constantly walk around with an aching ass, and there was just something about a ruined hole she found fascinating. Alex definitely prefered to be the one with a ruined hole, but in this case she was almost guaranteed to receive the same treatment almost instantly. Or at least she hoped she would be.
"So, what do you think baby?" Haley asked, breaking the long silence which had fallen between them.
"I think... that's the best gape I've ever seen." Alex grinned wickedly, before quickly adding so not to hurt Haley's feelings, "At least on you."
"Mmmmm, that's because Mom is a natural top." Haley moaned happily and closed her eyes as an after-shock of her orgasms suddenly hit her from just exposing herself like this.
"Clearly..." Alex agreed, finally pulling her eyes away from that gape and grinning wickedly again, "Do you know what else I think?"
"What?" Haley moaned dreamily, before opening her eyes, looking back and exclaiming, "HEY!"
Haley was furious to find her little sister's mouth wrapped around their Mom's cock. The cock which had just been plundering her butt and was covered with her anal cream. Cream which was rightfully hers. And Alex was stealing it, the greedy bitch. And the mental high of sucking their Mom's dick after she'd ass fucked one of them. Okay, it wasn't unprecedented for Alex to be greedy like this.
She'd removed her own harness to clean her own cock after an ass fucking before. A lot of times actually. But this was really crossing the line, and she was going to pay. Preferably with a brutal ass beating that not even Alex could enjoy, although Haley would enjoy it on multiple levels.