I wake up in a round chamber. The only thing I remember was saying "no" to a pushy woman asking if I could do a survey at the gym. I hear a beeping sound from the computer across the room, and I read out loud when it says things like "initiating growth hormone mixtures, inserting estrogen and progesterone and increasing settings to 200%" I freak out and even moan a little in sadness when I see a digital mold of my body while it manifests the expected results on screen, I freak out when I see what looks like tiny buildings near my feet and my muscles look like they shouldn't fit my body. When the gas starts pumping in, I start coughing and gagging, I feel funny and dizzy, I scream in terror and start banging on the walls to be led out. The gas turns a shade of purple when they pump in women's sexual hormones into the mix to REALLY, slowly make me horny. My mind starts feeling fuzzy and numb, I try to resist the changes until my nipples inflate and lengthen and it feels extra good. I start to think maybe this won't be so bad. I quickly change my mind when the first bursts of pain hit my abdomen, I hear my own bones cracking, changing, and growing. When I realize my arms are also bulging and growing, I scream in terror again and beg for it to stop, my clothes start to shred apart. I start breathing rapidly and loudly as I see my own reflection in the tube and watch in terror as my teeth sharpen and lengthen in front of my eyes. My voice starts to get beastly and feral. From here, my growth and transformations, both mental and physical, speed up in a hurry. My voice deepens as you grow bigger, I yelp an "ow" as my head hits the ceiling with a bump, I try to fight the new impulses from taking over, but the part of me who doesn't want to be a monster is losing and beginning to fight less the hornier and hornier the weird gas makes me. When my body fills up the chamber, I start to feel good about the change and want more of it. By the time the chamber's tube shatters and I burst out, I decide to take the initiative and suck in the gas from the pipe that's pumping it in, first sucking in the gas already in the room. That's when the claws start to come in from my bulging and growing hands, my feet growing and turning into talons, the last of my clothes shred away. My face has transformed so much my nose is huge and like a flesh-colored beak, when I fall onto all fours after the growth speeds up my nose knocks over and destroys the computer desk. That's when my back starts to really bulge out and change, the bone-cracking and growing increases as spikes poke out from my spine from top to bottom, and my shoulder blades. My orgasmic pleasure is really starting to over take my mental conflict now. I really don't want to be turned into a giant monster and keep growing, but it feels too good now. I keep building up to what I feel like is going to be a BIG one! I really feel myself losing control now!
Outside, everything seems peaceful enough until an earthquake coming from my prison hits and I burst out of the building. Panic hits the people as I come bursting through the debris and I'm almost a fully feral beast now trying to pleasure myself, ending when I finally orgasm hugely as I fall back on all fours to another big earthquake and loud echoing and beastly voice.