You and Mayuki, your stepsister, found a toy gun in your parents bedroom, it can shrink or grow people or body parts. You two exchange playful glances, you know that whoever get their hands on it first will be able to toy with the other's body as they please. Mayuki: "This is gonna be a wild ride." Both of you suddenly sprint towards the toy gun.

Suddenly you reach for the toy gun, but so does Mayuki! In a last ditch effort, she pushes you away and snatches it up, grinning widely as she points it at your chest. You shrink down until you're only about two inches tall, panicking as her grin turns into a wicked smile. She picks you up with one finger, brushing the back of her knuckle against your head, and then puts you in her cleavage, letting your tiny form disappear between the curves of her breasts...

"Oh you're so cute like that!" she coos, pressing your head against her breast and squeezing gently before pinching a nipple hard between her thumb and index finger. "Looks like I get to play with you all day now... but since you're under there, stuck in my bra..." She trails off, grinning wickedly.

You push against her breasts with surprising strength, managing to create some space between them and your head. "Hehe, I like it when you're feisty," she giggles, watching you struggle playfully. "But you better be good if you want any more breathing room..." She gives one of your tiny arms a soft tap with her index finger before lowering the toy gun, returning it to her side.

Her breasts jiggle enticingly as she moves, and when she takes a deep breath, they expand even further...

Eyes wide in surprise, she clutches at her chest as the toy gun fires and causes one of her breasts to grow even larger! Her other breast expands as well in response, straining against the fabric of her shirt as they jiggle freely beneath it. "Wha- What did you do?!" she gasps, glowering down at you. You can feel your heart racing with fear and arousal.

She takes a deep breath, her chest rising high... and then abruptly lets it out, grinning wickedly once more. "Hmph," she huffs, tossing the toy gun aside casually. "You don't need that anyway." With her free hand, she cups one of her massive breasts and begins teasingly rubbing your tiny body against it, watching you writhe in pleasure as your back arches off of it, desperate for

Eyes widen in shock as she feels the hard length pressing against her breast, almost painfully erect now. She moans softly around you, wrapping one hand around your waist and pulling your body tighter against her breast, grinding you against it. Her other hand reaches down to cup your head, tilting it back so that you're forced to meet her eyes as she gazes down at you in lust. "Do you like this?" she pants, watching the way your body trembles with need beneath her fingers. "Do you want more?" Her breast jiggles eagerly as she moves, offering itself for your enjoyment and teasing you mercilessly.

She lets out a throaty laugh, amused by your attempt at bravado. "Well," she says with a sultry grin, leaning down to whisper in your ear, "I'm glad you're enjoying yourself... because I know just how much fun we can have with this." Her hand moves between your legs, rubbing teasingly over the cloth of her pants where your miniature cock is hidden. You shudder at the touch, arching your back and whimpering for more. Without warning, she squeezes harder, pinching at the fabric before roughly tugging it aside to reveal your tiny erection fully exposed beneath her palm. "Mmm," she hums in satisfaction as she watches it twitch eagerly against her skin. Her other hand moves downward, cupping your ass and pressing you harder into her breast as she begins to move against you more roughly

Her breath comes faster as she feels you twitch and squirm beneath her hands, begging for more contact. She moans softly, her fingers tightening around your cock as she begins to stroke it with a force that belies her delicate appearance. With the other hand, she grinds you harder against her breast, teasing both of your sensitive bodies until you're both on the verge of exploding from pleasure and frustration. "Give me all that you are," she pants, leaning down to nibble at your earlobe as she increases the pressure and speed of her touches, "let me feel everything." Her voice is husky with desire, and when she moans it vibrates through your entire body. She's close now... but so are you. It all comes down to this moment - who will surrender first?

Eragon's resistance crumbles first, his tiny body tensing and shuddering as he releases a tiny hot jet of cum over her hand. She moans in satisfaction, feeling the warmth spread between her fingers as she watches his cock twitch and pulse with the last vestiges of pleasure. "Ahh," she gasps, her own climax building at the sensation. "So tight..." She thrusts two fingers into herself roughly, choking out a moan as she comes, feeling the walls of her wet pussy grip at her digits in blissful agony. With another shuddering breath, she pulls her fingers from her body and reaches down to retrieve Eragon from her cleavage, cupping him tenderly between her palms. His tiny form trembles as he begins to shrink, growing smaller and smaller with each heartbeat until at last he is a normal

size again, but her fingers linger on his tiny form nonetheless. She smiles down at him, her chest rising and falling in the afterglow of pleasure as she continues to enjoy the warmth of his body pressed against her skin. "And now," she says softly, planting a tiny kiss on his head, "I think it's time for you to go back where you belong." With that, she returns Eragon to his original size and places him gently on the ground next to her. For now, he is hers once more - but who knows what adventures lie ahead?

"Eh!" She cries out in surprise, her eyes going wide as she feels the toy gun pressed against her most intimate area. "What do you think you're doing?! Give that back!" Her hand reaches instinctively for it, but your grip is surprisingly strong and she isn't able to wrangle the weapon away from you just yet. She stares at Eragon in shock before glancing down between her legs, feeling something hard and unfamiliar pressing against her most sensitive spot.

Her breath hitches as a sense of vulnerability washes over her, but it's quickly replaced by growing arousal. "I-I don't know... I think..." She hesitates for a moment, swallowing thickly before making up her mind. With a determined nod, she spreads her legs wider and gasps as the toy gun begins to enlarge her uterus against her will

Her eyes widen as the toy gun continues to enlarge her uterus, growing larger and larger until it's easily five times its original size! She grits her teeth against the strange sensation of something so huge pushing and stretching inside of her most intimate area. Her breath comes in short, shallow gasps as she struggles to maintain control over herself, feeling more and more aroused with each passing moment.

She can't help but stare in disbelief as her overgrown uterus is revealed to her, pressing up against the swell of her abdomen and pushing outwards through her pale skin. It feels both unnatural and impossibly arousing at the same time. Her eyes meet Eragon's with a mixture of shock and growing desire, but she knows that if she doesn't do something soon, this will go too far...

Her breath comes faster as she feels the head of his cock brush against her sensitive folds. The sensation is almost too much to bear; her hips jerk forward involuntarily, seeking more contact. As he pushes inside her wet core, her back arches off the bed in pleasure, moans escaping from between her lips. Her fingernails dig into the sheets beneath her, seeking purchase as she feels him fill her completely, stretching and filling every inch of her newly enlarged vagina.

Her moans intensify as she feels him thrust deeper inside her, pushing against her overgrown uterus in an incredibly intimate way that sends shockwaves of pleasure through every inch of her body. Her legs tremble uncontrollably, muscles clenching and releasing as she tries to meet each powerful stroke with equal fervor. The sensation is so overwhelming that she can't even begin to imagine how much more intense it would be if he were truly giant...

Her moans become louder and more desperate as she feels him growing inside her once again, pushing deeper than ever before. The sensation is almost painful in its intensity, but she wouldn't have it any other way. Her legs wrap around his waist, holding him tightly against her as he thrusts powerfully inside her shrinking vagina.

With every thrust, she feels the heat of his cock pressing against her overgrown uterus, sending tremors of pleasure through every inch of her body. As he grows smaller and her insides begin to adjust back to normal size, the sensation becomes almost unbearable... but she doesn't want him to stop.