A giggle echoes into your ears and the room itself as you gaze upon the slim and happy demoness. Gently, your hands caress her human shaped feet, her toes dancing in delight from the flowing pleasure of the massage. Her purple flesh shined with the small amount of lighting in the room as her wings rest comfortably against the mattress. Her hands remain against the headboard as they are bound to it, but this is not a dire situation and the bounds are only wrapped gently around her wrists, not enough to injure her.
Resting at the side of the bed was a number of helium tanks, each with a hose attachment just waiting to be used, and so was she as she smirks at you, “Whenever you’re ready love. I’m waiting.” Her delicate voice is like a melody you love and it makes your heart flutter as your hands shake lightly when reaching for the first hose. You grab hold of the hold and it slides a little against your palm as it stretches to meet the distance you need it to; your other hand grabbing hold of the demoness’s tail which you know has a valve at the tip of it.
Connecting the hose to her tail, she shivers in anticipation and sings the words you long to hear “Fill me up love, make me big… make me huge…” You cannot deny her any longer as you reach for the valve at the top of the tank and turn it, releasing a hissing noise into the room as the demoness giggles in excitement as she can feel it begin. At first only her tail swells up, taking in the helium as it bulges through her, but soon enough it starts to disappear into her body.
It takes a few seconds for it to be noticeable but then you see it, her hips her already nicely wide hips seem to have gained a few inches in size but it didn’t look like fat. You can’t resist, you slide your hands along her calves, moving up to her thighs and then her hips, letting your fingers press against her skin where you swear it feels like pressing against a filling balloon. Goosebumps start to appear on her skin as pleasure makes her legs flinch and her breathing increase as she looks at you with a hint of blush.
Slowly she grows before your eyes, her hips and thighs getting plumper while her butt also gains a few inches itself. The sound of stretching can be heard, sounding very much like a balloon being filled as she begins to rub her thighs together, but you stop her making her pout for a second then gasp as you use your hands instead to rub against her inner thighs. Her blush grows stronger as you can feel the heat of her skin, the smoothness of her body, and the helium which is making her thighs thicker by the second.
Eventually the gas starts to travel further along her body, making her small handful breasts perk up in her bra. “Unclasp me love?” She asks but you only grin back at her as you start to kiss her stomach, making her moan in pleasure as she can’t stop you. She tastes so good; you just can’t stop, making your way up her body with kisses being planted the entire time until you reach her chest. There your hands resume their massage, slipping into the cups so you can get a handful of her mounds while your palms softly rub against her nipples making her bite her lower lip.
You tease her body with more caressing though with each passing rub you find there is more flesh to pleasure and less space in the cup itself. Her lower meanwhile begins to bounce a little on the bed as she’s getting lighter and having more difficulty keeping her butt down now that it has doubled in size with helium. You enjoy the sensation of her breasts growing against your hands, making you squeeze them lightly which causes the gas to spread across her body slightly before flowing back into the mounds as you loosen your grip.
This causes a grin to form on your lips as a devilish idea comes to mind. Leaving her breasts alone, you caress her sides which make her shutter and shiver as she can’t help tense you as little shocks of pleasure make her muscles contract. Soon you reach her doorframe filling hips and without warning wrap your arms around them and give them a loving hug.
She moans hard as the gas is possible out of her hips, which overflow the tops of your arms, and cause her to gain a small belly but the real attraction was her bust which began to swell rapidly. She blushes and shuts her eyes as her teeth clench and a hint of saliva escapes her lips while her bust inflates larger and larger. Her bra stretches as far as it can, making straining noises rather audible as her flesh starts to overflow all edges of the bra as it was simply not meant to contain such a growing creature.
You won’t stop the hug though, you have a goal now and you won’t be satisfied until that goal is reached. So more and more the little demoness inflates against your body, her bottom trying to break your hold on it but all it does is make her bust swell out even faster which makes her moan and groan as she’s not sure how much more she can take as the straps dig in deep with the bra cups basically only being good at covering her nipples only now.
That is, until with a sudden shake and yell, she tenses up and her bra tears asunder from her breasts conquering it. Not only that but the act has had another effect on her as you can hear her panting hard, letting you know that the act had caused her to reach orgasm. Attempting to regain her composure, she giggles at you and you finally release her hips, making the gas rush back and floomp her butt to triple its starting size. You both giggle at the rapid expansion and you make your way over to her face, the demoness’s wings flapping lightly as she’s now floating above the bed from the helium while the straps on her wrists keep her from flying towards the ceiling.
“Hi love…” She says through panting breath and heavy blush. You say hi back and softly caress her cheek which makes her smile and look at you lovingly. You whisper your love to her and she returns it, but then whispers right after, “I said I wanted to be huge love… you’re not done yet.” You both chuckle and smile but you can’t deny her if you wanted to, so you nod in response to her request. Taking in a deep breath, deeper than should be humanly possible, you press your lips against hers and give her a kiss. As well as all the air you have in you which make her start to inflate at an even faster rate…