Her submissiveness makes turns you on. A personal rubber maid, ready to do anything you want her to do. You could tell her to go outside and buy some groceries. Or maybe she could wash dishes and clean your house. Or...
You sit on the bed, spreading your legs apart.
'On your knees'
She sits down without hesitation.
'Come here'
She slowly crawls over to you on all fours. She looks up at you and the sheer look of innocence and obedience in her eyes makes you lose your cool completely. You pull down your pants and underwear, uncovering you big hard cock that yearns for some naughty action.
'Suck it'
No need to ask twice! She reaches up and gently grabs your penis, sending shivers all across your body. Her shiny latex gloves feel a bit cold. She traces her long, delicate finger down your cock to the balls.
'I will do my best, Master' — she whispers
She kisses the tip of your cock, moving her hands down to play with your balls. You moan a little.
Slowly, she takes your dick in her mouth. Her tongue caresses your sweet spots.
'Slurp~ Slurp~'
Up and down she goes, up and down. Every time she takes a bit more of your cock inside and it feels incredible. The wetness of her mouth, the texture and intricate movements of her tongue... Has she always been this good at fellatio? You don't care anymore as a warm, fuzzy feeling overpowers you, taking all your strength.
'Mnghhh' — you grunt, putting a hand on your girlfriend's head and forcing her take almost the entirety of you raging boner in. It doesn't seem to trouble her at all; in fact, she starts moving even faster. You can feel a powerful, mind-blowing orgasm coming. Your vision is hazy and you half-close your eyes, as you climax. A white flash fills everything, the pleasure making your whole body stiffen up. Your cock feels especially numb and for some reason it feels as if you're cumming and cumming with no end. You open your eyes and look down to see something extraordinary.
Your cock has gotten smaller and it's not even a penis anymore, it's a balloon's neck, complete with a rubber ring at the end! Your girlfriend is holding it in between her fingers, allowing the air slowly escape with a faint hissing sound. Wait, the air? Your whole body now looks as if it's made of thin red latex, like a toy balloon. You lift your hands up and surely enough, they are see-through.
'Do you like your new look?' — your girlfriend asks coyly, rubbing your red transparent belly with her latex hand, making squeaks and creaks.
She loosens her grip even more and you see your shiny red limbs deflating, pulling back into your body which becomes rounder and rounder every second. A red haze covers your eyes and you realise that now even your head got retracted into this new, round balloon. All you can feel now is your thin latex walls and your sensitive nozzle, held by your girlfriend. You can't scream: you have no mouth. You don't have anything now.
'Oh my, look at you! So cute! Let's make you a bit bigger' — the maid giggles.
She puts your nozzle-cock back into her mouth. If feels incredible, better than any blowjob! Her warm breath makes your latex a bit wet on the inside.
'Fffffff! Fffffffff~'
Your body is now almost as big as your petite, rubber-clad girlfriend. You can feel the pressure inside your round body push excess air back into the nozzle tube, making it inflate.
'Ah, here comes your neck! Now, to tie you up before you pop, cutie'
She skillfully grabs what's left of your cock, twisting it into a knot.
'Look at how pretty you turned out!'
She to a mirror and you see a short girl wearing a frilly latex dress hugging a gigantic translucent red balloon.