The belt under you slides by at an easy warm-up pace but you can see from the monitor your heart is racing. The heat in your stomach and chest has now turned into a tingle and itch that is spreading to the rest of your body. As you try and pull your hands and wrists free you fail to notice how large your nipples are getting or that your chest is swelling. But you do notice as a conservatively dressed woman walks past the window. She takes one look at you frowns in disgust and hurries on. You cannot tell if the red tint on your chest is you blushing or the burning you feel. The burning has now moved to your groin. As the pace increases you notice the spandex shorts aren’t pinching your balls anymore. You can feel the panties riding tighter into your ass. They should be pushing harder on your cock as well but all you feel down there is the tingling. Great I am going numb from these too tight shorts you think, as you break into a brisk run only 10 min gone from the timer. You are jogging like this for 5 more minute when a older tubby man walks past your window. His looks your way and smiles as he walks by taking his time. The look he gives you is amused and a bit lecherous.
You shout out” What you looking at fat man!” your voice breaking higher as you shout, ending up sounding a lot like your sister. He gives you a middle finger and storms away. “What the Fuck… oh shit… “as you continue to swear you cannot get your voice to drop any lower. It just softens and floats to a very feminine alto.
20 min gone and you notice the bounce. Not all of you is moving in sync anymore you can feel your ass cheeks quivering as you step. Your chest is now bobbing a half step behind you as you run. You are in fact Boobing up as you run. You look down at the once flat sports bra and see it is filled now with at least B cup breasts. As you watch you can see them filling out bigger up though a C filling the sports bra very full but they are not stopping.
Your sister was always small breasted. You used to peek at her when you were younger. Her bra size had been a small b till last year when she had them done up to a very full C. This is the size of the sport bra you are wearing. Now you know how she had them done. It must be her invention she has gone away to show off. Now the hint at her secret invention make sense. She said it would make a big enhancement in plastic surgery for women.
As you watch they keep increasing. Your new breasts push the straining fabric of the sports bra down. The friction this causes on your nipples makes then stand out. You can’t believe how big they are over ½ “ tall and getting longer. They'er tenting the bra at every step , riding higher. You are now a full D cup and still expanding. The bra straps cannot hold them up and the buckles in the back slip. The Bra straps sliding off your shoulders letting your tits bounce even more. The tit flesh pushing out the top of the bra till it acts more like a shelf pushing them up .Your Long nipples covered by the wide straps not by the bra cups. Your breasts now bigger than D. Now you know what extra strength ment. This is when you notice you are not the only one watching your breasts as they outgrow and try to bounce out of the too small bra.
A young man maybe 19 or 20 is standing in front of the window looking at you. His mouth a bit agape and his hand adjusting his swelling cock in his pants. You look down and see 5 min left on the timer. You hold your tongue this time Sure your swearing will attracted more people over. You blush again as he starts to stroke himself through his jeans. His brazen act makes you miss a step and that is all your huge breasts needed to escapee the top of your bra. You can’t even try to cover yourself. You just blush and your now ¾” tall and ½” wide nipples stand out and wave to him as you continue to run.
The tread mill starts moving. It inclines up to 30 degrees and the belt speeds up. Seems the last part of the run is an uphill sprint. Great I am jogging topless with DD cup breasts and this guy is looking right at my crotch. As you step up higher you can feel the shorts riding up into you. And that panics you because what you should feel in the way is not in the way anymore. Your ass has gotten bigger and is half out the bottom of the shorts. This has drawn the panties and spandex so tight to your crotch it feels like it is splitting you open down there. You should feel your cock and balls but you only feel what use to be the head of your cock, Your new clit. It is small and rubbing on the fabric. The feelings are more intense than you ever felt before. You start to get turned on, your body responding to the rubbing. As your new pussy opens the spandex gives you a very visible camel toe. Then the moisture comes leaking from your turned on pussy. Your juices wetting the spandex and turning it a darker color pink. The man rubbing his hard huge cock faster as he watches you get turned on by running topless for him. Your sweat making your soft skin glisten as you work hard. You’re breathing fast from both the workout and the rising excitement of your pussy. Not understanding why but you are so horny and it is with a women’s thoughts of getting fucked. The timer reaches one min and the tread mill shifts back down to the floor slowing for a cool down walk.
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