Tammy strikes a deal.

With a deep groan, Mike bottomed out and began pumping Gina’s ass full of cum.

It just kept coming and coming, and Gina, who had collapsed onto her large tits while leaving her big ass up in the air, simply shivered and mindlessly moaned as he filled her up.

She came several times during Mike’s relentless pounding, and her own cock had fired off enough seed to soak the carpet where her knees were digging into.

Slowly, he pulled out of her, every inch of his huge cock slick with cum.

Sitting back down, Mike picked up his shorts from the floor and wiped it clean.

He turned when he heard Tammy squeak, suppressing her sounds as best she could as she too came from jilling herself senseless at the spectacle.

She couldn’t look him in the eye. It was too embarrassing that she‘d gotten so turned on by her sister’s transformation to begin with, now even more so that her younger brother was staring at her quivering body as she rode out one of the strongest orgasms of her life.

By the time it was over, Tammy was still a bit shaky, but retracted her hands from her purple leggings before wiping the juices off on her white tank-top.

It took a great amount of effort, but she turned to look at Mike, who was sitting back against the couch and stroking his cock, which was just as steely and leaky as ever. He wasn’t smiling, but he didn’t look predatory either. He simply looked surprised.

“Shut up.” Tammy said, turning away and blushing.

“I didn’t say anything.” He chuckled.

“Didn’t have to.” She rolled her eyes. “Anyways…”

“Right.” Mike said, picking up his device from the couch. “Your turn?”

Tammy thought about it. She definitely wanted to be sexed up like her half-conscious sister, but she was worried about what Mike might do to her. Hell, Gina had tons of stuff done to her, which wasn’t exactly something that Tammy wanted for herself. Not to mention, if she had a request, she wouldn’t even notice one of the changes…

Then again, Mike just might be screwing with her.

The change in Gina’s hair and piercings might’ve been the things they weren’t supposed to notice, but Mike wound up mistaking that he could actually change someone without them knowing.

There were a lot of variables to consider, and-

“Well?” Mike asked, his expression flat and bored. “Any day now.”

“I’m thinking!” Tammy snapped at him.

“Sor-ry.” He said sarcastically, then turned towards Gina. “Hey sis, wanna go another round while Tammy thinks it over?”

With her face against the carpet and ass still high in the air, Gina just giggled and groaned, letting them know she needed some time to recover.

“Damn.” Mike chuckled, reaching over to slap Gina’s giant ass, which resembled two beach balls made of jelly, and jiggled as such.

“Whatever you do, don’t go all-out like you did with her.” Tammy said, crossing her arms. “She might be cool with a makeover, but I just want some curves, and by curves I don’t mean… those.” She said, extending a hand towards the impossibly curvy Gina.

“Okay, okay.” He said, grinning like a guilty idiot as he fiddled with the device. “So, just some boobs and a bigger butt?”

“Yeah, but…” Tammy bit down on her lip, her face turning a bit red as she locked eyes with Mike. “What’s it going to take to keep you from doing anything that I might not notice?”

Mike gave her a thoughtful expression, taking a moment to think about that.

“I dunno’…” He mused. “I can’t think of any way around it.”

”You could just not be a shithead about it.” She said, scowling at him. “How about a blowjob?”

Mike considered that for a moment, then his eyes lit up.

“How about a blowjob whenever I want one?”

Tammy blushed hard. She instantly began to imagine that type of arrangement. Him barging into her room with his cock out, passing by him in the hallways just for him to take her up on one, or even just a text message when she’s away from home and hanging out with her boyfriend.

Shit, she thought. Tammy totally forgot that she had a boyfriend. **** or not, cheating was cheating, even if it meant that her sweetheart could have a big pair of tits to play with when they had some alone time.

Still, the end result would benefit her boyfriend, and she couldn’t deny that the thought of being Mike’s personal blowjob slut was pretty hot…

“F-Fine.” She said nervously. “Just hurry up before I change my mind.”

“Hey, that should be my line.” Mike chuckled, holding his cock by the base. “Go ahead and get sucking.”

Tammy’s heart skipped a beat, but after a few seconds of hesitation, she leaned over and slowly gripped his throbbing cock with both hands.

“I-I don’t know how much I’ll be able to suck, really.”

“Just do your best.” Mike said with a sigh, clearly having a reaction to Tammy’s firm grip.

Slowly Tammy turned to lay sideways on the couch before she descended on Mike’s cock. To her surprise, when her lips made contact with the head, it didn’t taste salty at all. It was sweet, like candy. This encouraged her to close her eyes and allow the thick head past her lips.

She’d sucked dick before, but this was different. Her brother’s cock was delicious, and her mouth was beginning to water. She went further down, but was only able to fit about four inches before it ran out of room.

Then, she felt Mike's fingers stroke through her hair. With his palm flat on the back of her head, he pushed, and his cock went further down into her throat with ease. Her eyes went wide at the feeling of her skin stretching like elastic to accommodate it, but her pussy became electrified at the foreign sensations.

Mike must’ve used his device thing to make that possible, Tammy thought to herself as she found that she could easily take more of his mighty shaft, filling her up more and more.

Once her hands ran out of space to hold onto his cock as her greedy mouth enveloped it, they slid down her body in an attempt to masturbate while she blew her brother.

However, as soon as she got to her chest, her fingers danced around a pair of jiggly masses that weren’t there moments before.

She couldn’t see them from her awkward position, but she had tits now! Not as big as Gina’s and maybe only a bit smaller than her mother’s, but they were there, and boy were they plush. Her fingers sunk into the bare flesh, which made her realize that Mike must’ve made her naked, too. That would explain the silky smoothness of her thighs as she excitedly rubbed them together.

Still impaled on her brother’s cock, Tammy turned to get more comfortable on the couch, propping herself up on all fours before bobbing her head up and down as if her life depended on it.

In truth, she just wanted to finish the blowjob as fast as possible so she could check out her new figure, and the fact that she didn’t need to pop off of his cock for a breath of fresh air was a helpful little detail she noticed.

Not long after that, Mike let out a groan before his hard cock tensed up in her stretchy throat. Tammy bottomed out with her face in his crotch at the realization, and he blasted a load as large as the one he pumped into Gina’s ass.

The flow was constant for a while, but slowed into slow spurts as his heavy balls emptied inside of her. By the time it was over, Tammy slowly pulled off of him with a *pop*, her stomach feeling weirdly full.

She gasped for a deep breath and leaned back, propped up on her knees as fresh oxygen swam through her lungs and into her brain.

Looking down at herself, the blonde confirmed that she was now naked, but also fairly busty.

Her eyes lit up as her hands shot up to grab and squeeze them. Like Gina’s and her mother’s breasts, Tammy’s were perfectly round, but extremely soft. They looked to be a bit smaller than cantaloupes, and were surprisingly sensitive.

She looked up at Mike, who had his arms spread out along the back of the couch as he appeared to be catching his breath.

This made Tammy smile devilishly, feeling proud of herself for having given such an amazing BJ.

Sure, the device helped out, but she was the one who had done the deed.

Tammy eagerly stood up to inspect her rump, and as expected it was definitely bigger! Before, she barely had anything, now she had a round, heart-shaped bubble-butt that you could bounce a quarter off of. It wasn’t nearly as wide and pronounced as Gina’s, but Tammy thought it fit perfectly on her slender frame.

Wait a second, Tammy thought to herself as she pushed her big tits apart to get a look at her stomach.

“Holy shit!” She said, looking towards Mike. “I have abs now!”

Mike, still looking a bit dazed, simply smiled and nodded.

“This is so cool!” She squealed with delight, skipping off to her room to try out some clothes, if they even fit her anymore.

Of course, she was definitely going to jill off in front of her mirror a few times, as well.

Mike watched his sister and her new curves bounce towards the hallway and out of sight, then sat up on the couch and stretched his athletic body before letting out a yawn.

Gina seemed to be recovering too, finally letting her huge ass fall over so she could try to sit upright.

The two looked at each other with sleepy smiles, then laughed.

“I’m pretty worn out, how about you?” Mike asked.

“Yeah, I didn’t sleep all that well to begin with last night.” Gina nodded.

“Same… Wanna go take a nap with me?”

“Sure.” Gina grinned. “I get to be the big spoon, though.”

“Fine by me.”