The doorbell sound announced her arrival. You smiled with anticipation as the hero walked through your door. Her eyes fixed on you as she maintained an expression of disinterest. Her large breasts jiggled as she took a note out of her pocket and read it trying to fake enthusiasm.

“Good morning, dear winner! You, the lucky winner selected from a large number of participants, has been selected to spend a whole day with your favorite superhero. In this case...”

She made a little pose raising her arms and placing her hand behind her nape. Her breasts bounced and her butt jiggled through her suit.

“...me, Elastigirl! Or... just Helen, if you like. Sigh. Ok, what do you want to do first?”

Helen grinned and blushed as you slapped her ass. "Well, aren't we bold?" She giggled before stretching her arm out to offer a handshake. "Alright then, what do you want to do first? We have the whole day together..." Her eyes sparkled with curiosity and excitement beneath her mask.

As she waited for your answer, her tail swayed back and forth behind her. She'd only allowed fans to see that part of her in recent years...a small detail they seemed to go crazy over.

Helen raised an eyebrow curiously. "Well...my powers allow me to stretch up to twenty meters. However, I have my limits too, you know? Why do you ask?" She took a step closer to you and playfully tugged at her collar with one finger. Her expression turned teasing as she spoke.

"Do you want to see how far it goes or something...hmm?" Her large breasts jiggled with each movement, almost tauntingly.

Helen stiffens slightly as you grab the device and use it on her. She tenses up momentarily before relaxing, a look of surprise flitting across her features. Her breath hitches audibly as she reads the results aloud, her voice barely above a whisper.

"Um...according to this, I'm...really into domination, humiliation, bondage...and...giving up control to someone else..." She blushes deeply and looks away, struggling to meet your eyes. "I-I can't believe that's true."

Her hands shake slightly as she tries to compose herself. This revelation leaves her feeling exposed and vulnerable. "Is...is there anything you want me to do?" Her voice cracks slightly, revealing how conflicted she feels about these desires of hers.

Helen gasps as the device's effects take hold, her eyes going wide with surprise and arousal. Her cheeks flush bright red, making it seem as if she's blushing from head to toe. She takes a few shaky breaths before looking up at you, her voice barely more than a whisper as she asks,

"So...you want me to control you? Make you into whatever I desire?" Her words are laced with temptation and lust, betraying her true feelings despite her efforts to deny them. Her large breasts heave visibly beneath her suit as she takes another unsteady step closer to you.

Her gaze drops to your crotch before rising back up, meeting your eyes with a mixture of hunger and curiosity. "Is that what you want too? To give me control over everything?" She reaches out to gently touch your cheek, her fingers trembling slightly as she does so. "Because if it is..."

Her words trail off into a low moan as she leans in closer still, lips parted expectantly. Her desire for dominance and submission is written plainly on her features, a tangle of conflicting emotions making her all the more enticing.

Helen's breath hitches as she feels your skin beneath her fingertips, the heat emanating from it threatening to undo her completely. "Tell me what you want," she murmurs, leaning even closer. "Tell me if I should make you into...anything specific." Her words are laced with desire and temptation, a mix of arousal and curiosity that makes it impossible for either of them to think straight.

As her fingertips trace delicate circles around your jawline, Helen's body quivers with need, her nipples hardening through the fabric of her suit. "I want...to see what you'd be like as a...futanari," she gasps softly, her eyes locking onto yours. Her heart races in anticipation of your reaction, her breath coming faster now as she imagines what it would feel like to have control over such a situation...and such a person.

"Would you want that?" She asks the question with just the right mix of sweetness and danger, her voice low and husky from desire. "To be transformed into...something else? Something I could control completely?" Her hands move up to rest on your shoulders now, holding you steady as she waits for your answer.

Helen's lips part in surprise at your response, but she quickly recovers, a mischievous glint entering her eyes. "Very well," she says, taking a step back to look you over carefully before reaching up and pulling off her mask. "Let the transformation begin." With that, she cups her hands around your head and pushes, causing you to double in size almost instantly as your body expands into curves, long, flowing hair growing out where there was none before. Your chest flattens, becoming feminine once more while your legs grow thinner and longer, making room for the new shape of your hips. As her hands push further down on your head, you're altered even further: muscles disappear from your frame, replaced with soft, rounded curves; facial features shift into something exaggeratedly feminine; and between your legs...well, that's where things get truly interesting as it swells into a sizeable cock that now hangs heavily between your new breasts.

Finally, she lets you go, stepping back to examine her work with interest. "There we are," she says, clapping her hands together appreciatively. "Our very own futanari Elasticgirl. What shall we do with it now?" Her voice is laced with lust and power as she looks you up and down once more, clearly enjoying the control she has over your new form.

Helen smirks as she takes in the sight of you now, her new form. "I think I have just the thing," she says, reaching out to fondle your newly enlarged breasts. Her hands are surprisingly gentle despite their strength, and she gives each nipple a teasing tweak before letting them slip free. She takes a step closer, lowering her voice even further. "Why don't you ride me?"

Her hips start to undulate in time with the words, mimicking the movement of riding on top of something substantial. As she speaks, her hand slides between your legs, grasping at your new cock and starting to stroke it slowly, skillfully, driving you both closer to the edge. "Let's see how well this futanari form of mine handles being...claimed by another."

Her gaze locks onto yours, hungry and unyielding, daring you to refuse her. The strength in your arms has vanished, replaced with a throbbing need that makes it impossible for you to deny her anything. With a moan of surrender, you lower yourself down onto her, feeling the warmth of her body envelop you as she gasps out your name in pleasure.

Helen cries out as you slide down onto her, the sensation unlike anything she's ever felt before. Her body arches upwards to meet yours, her eyes fluttering closed in a moment of intense pleasure. She bucks her hips upward, grinding against your new form, feeling the thickness of your cock as it slides against her clit and inner thighs.

With every thrust you make, she moans your name louder, giving into the forbidden sensation that surges through her veins. Her fingers rake through your hair, holding you close as her body quivers with anticipation for what's to come. The taste of your skin against hers sends shockwaves of pleasure coursing through her, making it impossible for her to focus on anything but this moment and the person who has become part of her in this twisted game they play together.

Her breath comes in short, ragged gasps as she feels herself drawing ever closer to the edge, the tension coiling tight inside her until she's sure she can no longer stand it. Finally, with a shuddering gasp and your name on her lips, Helen releases control into your hands, allowing you to finish what you've started.

Helen's body trembles and shudders as the release washes over her, her eyes squeezing shut in ecstasy. The grip on your hair tightens briefly before relaxing, her breath coming out ragged and hot against your neck. She lies there panting for what seems like an eternity, her entire body feeling lighter and more relaxed than it has in ages. It's times like these when she truly wishes she could give in to these desires permanently...but she knows that isn't possible. Or is it?

The thought sends a thrill of anticipation coursing through her, making it difficult for her to focus on anything else but the afterglow of pleasure still lingering around them both. Her hand trails up your body, coming to rest on your chest, feeling surprisingly firm and strong beneath the feminine curves. She wonders what other transformations she could make you go through today...

"And how about that lactation fetish?" she asks softly, her voice still shaking with residual arousal. "Do you want to taste it? Or would you rather see where else it would flow?" The question hangs in the air between them like a physical thing, making the possibilities seem endless and thrilling.

Helen smiles as she feels your body respond to her words, her heart racing at the thought of where else this day might lead. "Oh, you can taste it," she whispers, leaning in closer still and pressing a soft kiss to your neck before tracing lazy circles around one of your nipples with her thumb. The tip grows hard almost instantly under her touch, and she grins, looking up at you through her lashes. "I think I'll start here..."

Helen's thumb and forefinger pinch the engorged nubbin between them, teasing it harder until a bead of clear liquid forms at the tip. Her other hand finds its way to your lips, pressing them apart gently before bringing her fingers close. "Here," she says softly, her voice husky with desire as she teases you with the offering. She waits, watching your reaction intently, her heart racing faster than ever now in anticipation of what might come next.

Helen freezes as she realizes that the device has a randomization setting. Her eyes widen in surprise and then narrow slightly in anticipation. "Very well," she murmurs, her voice low and throaty. "I accept your challenge." She grins wickedly before leaning in to kiss you once more, her tongue darting out to dance with yours briefly. As the kiss ends, she reaches down between your legs and gives your new cock a hard tug. "Let's see what fate has in store for us both today..."

Her words send a shiver of anticipation through you, making it impossible not to respond as she starts stroking you faster, her other hand still playing with your nipple. The sensations are overwhelming, leaving you helpless and aroused beyond reason. With each thrust of her hips, she moans out encouragement, urging you both towards the edge.

The feeling of being completely at her mercy is exhilarating, making the possibility of any outcome seem thrilling. You can feel your body tense up in anticipation of whatever change might come next, eager to embrace it fully and explore the new limits it will undoubtedly present.

Helen gasps as her fingers brush against your sensitive flesh, eliciting a moan from you. Her eyes flutter closed briefly before opening again, fixing on yours in a heated gaze. "So tight," she breathes out, thrusting harder against you. The sensation is overwhelming, leaving her shuddering with pleasure and the anticipation of whatever change might be coming next.

Her body trembles and shudders as she comes, her moans filling the air around you. Her nails dig into your shoulders, leaving tiny trails of pain that only serve to heighten the pleasure coursing through her veins. As the wave of release subsides, she collapses onto your chest with a contented sigh, their bodies still tangled together in a messy heap on the floor.

Her eyes flutter open, and she looks up at you through her lashes, her expression softening. "Well," she says with a small laugh, "that was...unexpected." She traces circles along your jawline with her fingertips before leaning in to press another gentle kiss there. "But...I think I liked it."

As you feel the device activate once more, your heart races with anticipation and fear. You don't know what to expect, but you can only hope that it will be as thrilling as everything else that's happened today. Helen watches intently as your body begins to shift and change, her eyes growing wider in surprise with every new development. "Oh my..." she whispers, her breath hitching slightly. "I don't...I don't even know what you are now."

Her hands slide up and down your back, exploring the new texture of your skin as she tries to adjust to the changes. The tension in the air between you is palpable, charged with a mix of lust and curiosity that makes it difficult for either of you to focus on anything else. Helen leans in closer, her lips brushing against your ear before whispering, "Whatever you are now...I still want you."

Helen watches curiously as you examine your new form. Her eyes widen in amazement and arousal when she sees the changes, taking in the details of your scaled skin, the spiky protrusions along your back, and the long, sinuous tail that swishes lazily behind you. "Well...I've never seen anything quite like that before," she whispers, her breath tickling your earlobe. Her fingers dance across the ridges of your scales, tracing patterns and exploring every inch of your new body.

Her lips brush against your skin again, this time moving higher up to trail over one pointed spike on your shoulder. "You're truly incredible," she murmurs, her voice shaking with emotion. She leans in closer still, pressing their bodies together from chest to hip as she lets out a shuddery breath. "And I want...I want you all to myself." Her hands slide underneath your arms, lifting you up until your body is flush against hers once more, her lips finding yours in a hungry, passionate kiss that leaves no doubt about what she means.

Her tongue darts out to dance with yours as their tongues twist together, and her hips rock back and forth between your new form, grinding against the spines on your tail and causing exquisite pleasure to surge through both of you. "Oh yes," she whispers hoarsely, her nails digging into your back. "Let's see where this takes us..."