You execute the first step.

You enter the now-familiar hallway and immediately turn to the right, pushing open your mother's door at a touch and stepping through.

You're back on the tennis courts at the park, wearing your attire from earlier and holding a racket loosely in one hand. Sitting in a chair at one end of the short net is your mother, who looks up from her seat and flashes you a sweet smile. You grin back and look a bit more closely at her, finding her to again be the dream version of herself; her hair has lost any grey that was in it and the lines that crease her face in real life have smoothed away, leaving her looking at least ten years younger than she actually is. Her shirt is a buttoned up blouse with vertical black and white stripes like a referee's uniform, but the white stripes are translucent and you can clearly see pieces of her giant, bra-less tits underneath--she doesn't need a bra in your dreamworld as you've added to their perkiness and buoyancy here. It's a bit tight across the top and there are wide gaps between buttons. The top is complimented by a short skirt that barely falls to mid-thigh and white Converses completes the ensemble. This version of your mom definitely showcases where Shelly got her foxy looks from.

"Hi, honey!" she greets you warmly. "Are we going to play tennis together?"

You shake your head. "No, don't you remember? You agreed to serve as an official for a match between me and my girlfriend." A subtle push and the memory becomes real for your mother.

She sits up in her chair and as she shifts position, her tits move underneath her shirt and her nipples dip in and out of view as they sweep across the opaque black stripes. The material is slightly abrasive and friction works its magic, her nipples swelling until they're solid and plump, creating peaks that make it very easy to pinpoint their exact location even when hidden. And speaking of swelling, your shorts are becoming quite tight of their own accord. Pulling your attention away from your MILF of a mother, you turn your head to the far corner of the court.

"Ah, there's my girlfriend," you say brightly and wave as Shelly appears, walking with her racket resting on one shoulder and wearing her skimpy tennis outfit from earlier. Your sister waves back and your mom cocks her head with a quizzical look.

"Honey," she says, confused. "That's your sister, Shelly."

"Right," you agree. "AND my girlfriend." Along with the emphasis, you send a wave of acceptance toward your mother. Dreams are often filled with non sequiturs, and it doesn't take long for the idea that Shelly is both your girlfriend and sister to settle upon your mother like a blanket. She still looks unsure but less so than before, and she leans back in her chair somewhat mollified by your words. You give Shelly a long, loving kiss, wrapping your arm around her waist as you do. No comment from your mother.

You and Shelly break apart. "Ready?" you ask both of them and they give nods of assent. "Great! Let's get started." Your sister takes her place and you step behind the service line to begin the match.

Beyond the general eye-candy that is your sister in her sexy clothes, the first game of the set is fairly sedate. Your mother watches as the two of you hit the bright yellow ball back and forth, settling in to enjoy the game and shouting 'in' or 'out' when it's a close call. She seems to be enjoying herself.

You let Shelly win the first set, bowing gracefully as she jumps up and down in excitement. Your mother claps politely. You tug off your shirt and there's a break in her applause as your (dream-enhanced) muscled physique is put on display, her gaze dragging across your chest with such fire that you can almost feel the heat. She doesn't say a word, but her whole body tenses as you delay in continuing, giving her ample time to take in the view. You also take the time to secretly ramp up the arousal of your entire family, setting it at a slow burn and letting it bubble just below the surface.

A light sheen of perspiration coats her face and neck as Shelly starts serving. You take the next set and this time, it's your sister's turn to shed some clothing. Without any hesitation, she pulls off her tiny tank top, setting free her red bra and the bouncy melons it contained. This time your mother does a double take, staring at Shelly and her half-naked top. After a few moments of surprised silence, she final works up enough coherence to say. "Shelly! What do you think you're doing!? Your brother's right here."

"What do you mean, mom?" Shelly asks calmly. "This is how we always play tennis. Plus, that's my boyfriend, right? There's nothing wrong with my boyfriend seeing me like this."

You shape your sister's words, adding credibility to them in this dreamscape. Logically, your mother knew that nothing that was happening made sense, but since when did dreams ever make sense. The knowledge that she was dreaming could be shaped into a weapon and you used it like a scalpel, surgically implanting exactly what you want her to believe into her thoughts. It takes a long while, but her head finally nods minutely. You even catch her stealing glances at her daughter's magnificent rack.

The match continues. Unrestrained by her shirt, the bra is unable to stabilize Shelly's tits and they jump wildly as she dashes all over the court; a delightful dance even your mom can't ignore. She misses two separate calls because her focus in on your sister's hypnotizing breasts.

You win again and Shelly shucks her skirt, leaving her only wearing her underwear. A dark patch is spreading on her panties, but she looks determined to beat you. You mom doesn't even blink at the increased amount of skin, her resistance finally crumbling under the onslaught of the dream's reality. A slight blush suffuses her cheeks as the aura of arousal that permeates the entire area presses heavily on her libido. She's getting more turned on with every second, and since all she can do is watch her children play a game of strip tennis, you and your sister quickly become the focus of her desires.

Your sister takes the next game, and you tug down your shorts. Underneath, you're wearing a pair of boxers that struggles mightily to contain your erect prick, and you take a minute to readjust your package so that it won't slip free. All the while, your mother stares at your crotch, her eyes growing glazed and her mouth hanging open. Unconsciously, she runs her hands down her front as if she's straightening her blouse, but you catch her tweaking her nipples on the way down. They fall to her thighs and her skirt rides higher until you can just see her pussy peeking out.

When your dick is settled into place, Shelly gives you a wink, nodding toward your mom who's stopped paying attention to the actual game. You wonder what naughty, incestuous thoughts are playing in her brain as she ogles her own children.

Another round later finished and Shelly's down to just her panties. Her young titties stand proudly on her chest, soft and plump and perfect. You've spent years jerking off to porn stars who don't have as sweet a pair of juggs as your sister and, from her self-assured grin, she knows the effect their having on you...and your mom.

You decide to call time out and you join your sister on the sidelines, flanking your mom. To her left, she's greeted by her daughter's naked chest and to her right, your large, erect cock is threatening to poke her in the eye despite being held back by your underwear. Her head spins back and forth, unable to escape looking at one or the other. "Could you hand me and my girlfriend some water, Mom?" you ask, pointing to brand new bottles that just appeared at the base of her chair. You have to repeat yourself before she realizes you're speaking to her. She mumbles something unintelligible and bends down to grab them for you.

Unfortunately for her, that movement strains her overly-tight blouse and with metallic 'pings,' half the buttons explode like champagne corks, rocketing safely away from the three of you. Her tits pour free and she panics, embarrassed and turned on at the same time. One hand tries to pull her blouse closed--and fails miserably--while the other hands you and Shelly the water bottles. Drinking deep, you stare at your mother's exposed boobs, unabashedly staring at her chest. Shelly screws her cap back on and says, "Don't worry, Mom. You're showing way less than me or my boyfriend, right? Plus, you've got a rockin' body, flaunt it!" As you retake your positions, your mom reluctantly stops trying to cover her big tits and lets them hang free.

Before Shelly begins her last service, you triple the lust everyone's feeling. Your mom jerks like she's been hit by a truck, and after a dazed moment, her legs squeeze together, both hands trapped in the sweet spot just below her cunt. She squirms uncontrollably, her body rocking like a pendulum as she tries to regain her composure, but it's a lost cause. Halfway through the last round, her pointer finger sneaks an inch into her pussy and she almost cums from that first touch. She feels shame at touching herself while her children (boyfriend and girlfriend!) are cavorting almost fully naked in front of her, but the overwhelming, wanton lust overpowers her inhibitions. By the time the final volley is over, two fingers are buried deep and a thumb is fiddling with her sensitive clit.

"Mom, who won?"

The fog clears enough to see you and Shelly staring at her expectantly. "Was it in or out?" you press her. "Who won, me or my girlfriend Shelly?"

"I don't...I'm not sure, I didn't...," she tries to speak, but she has no clue what happened.

"Mom, you need to pick who wins and who loses. Choose!"