You've been working in the reptile exibit for about a month now, you even volunteer for more of those overnight shifts! Management thinks you're showing great initiative when you're really just making sure you take every opportunity you can to "play" with the snakes when no one's around. You're addicted to fucking snakes. It just feels too good to stop! You start to play with larger snakes like the reticulated pythons and boa constrictors. They have much more powerful muscles and are capable of massaging your cock better, though, they feel kinda too big to be as enjoyable as the smaller snakes. Still, you really want to thoroughly enjoy the big snakes too. One night, you bring in something special that should help with your goal of mating the big snakes. Its a small bottle of pills you ordered from a fetish website. It claims to make your cock several inches bigger! You're pretty sure they're just sugar pills but hey, if they work, you can finally mate those big snakes. You take one of those pills and swallow it with a gulp of water. You wait a while, watching a video you took of yourself fucking one of the green tree boas. It doesn't feel like anything was happening. Maybe the pills really don't work but if anything, you do feel horny. To decide take another pill just to be sure. While you waited for it to take effect, you decide to revisit that corn snake you first fucked a month ago. Its really gotten pretty big and fat from all that cum you've been feeding her. No one really suspects anything though. You take her out of the enclosure and bring her over to the table. You've done this with the corn snake that she already knows what to do. Her mouth opens up wide for you as your shove that throbbing cock right in. She immediately takes to swallowing your cock whole, her muscular walls squeezing your cock in pleasure.
As she keeps working on your cock, you moan loudly, your mind going wild thinking about how big she is going to get if you keep feeding these her more of your cum. Your cock throbs intensely inside the snake's throat as it shoots precum into her stomach. It almost feels tighter than usual, like the corn snake was shrinking. It turns out those pills really do work but you haven't noticed yet. You groan louder as you roughly keep fucking the snake's throat. Every time your cock throbs and pulses, it grows a little bit bigger, reaching deeper into the snake's long body. You moan loudly, thrusting harder and faster as you feel your orgasm building. You can't hold it back anymore, your orgasm overtakes you and you start to cum deep in the snake's belly. You moan loudly, your cock pulsating and throbbing in the snake's throat. As you finish cumming, you feel the snake start to twitch and convulse. You look down at your cock and see that it has grown considerably and has become very thick and long. You were pretty average before, about five inches long and about as thick as a hotdog but now you were down right impressive. Over seven inches long and as thick as a sausage! You can distinctly see your cock outline in the snake as it reaches nearly half way down the snake's body. More over, you're still completely hard and you want more! You firmly grab your cock, squeezing the snake's body around your cock and start to stroke yourself, using the snake as a proper cock sleeve. It feels amazing to stroke yourself with the snake wrapped around your cock like this! The snake begins to shake violently and start to squirm around. You look down at the snake's stomach and notice its bulging with your seed.It seems as if you could fill up that entire snake with your seed alone! The snake starts to thrash around wildly, its tongue flicking out to try and lap up your cum. It seems to be having a very difficult time trying to get any of it up its gullet. It was so full with your cum that it couldn't move properly. You groan loudly as you keep fucking the snake, your cock growing bigger still! Its nearing a full foot in length and a little over two inches thick! Your cock completely fills the snake like a condom and your cum was causing it's body to start to round out like a balloon on a faucet. You can feel yet another orgasm building in you but you want more! You look down at the snake again and you realize something. The snake is starting to swell. She's getting bigger and bigger as your cock pumps load after load of hot sperm into her. You moan and gasp, thrusting faster and harder into the snake's body. The snake is shaking and quivering, its muscles twitching as it continues to swallow your cock down her throat. You moan loudly as you cum once again, cumming deep in the snake's belly.
The snake was swelling bigger like a balloon. It was rounding out. One foot, two foot. Three. Four. It slows as it reaches five feet around! There's no way it would fit back in the enclosure now! You had a bigger problem though... as you pull out of the overinflated corn snake condom, you notice two things. Your cock was well over eighteen inches long now and that you were still painfully erect! Maybe taking that second pill was a bad idea.