...Sam finally looks directly at you and starts to moan. "Urrrrr.... I didn't realize how far you have changed or how...how good you look" she said quietly looking up and down your body. "I...I...I should...look...away" she said, whilst out of the corner of your eye, you noticed a trickle of clear liquid running down her inner thigh from her already tight bikini underwear. She tried to turn away, but she couldn't steer her eyes away from your defined pecs, slightly broader torso, your now thicker thighs covered in a light coating of hair or your larger but still almost painfully erect dick.
She backed away, managing to lean against a tree. The sight of her getting so worked up was not helping your situation at all as the flow of pre started again to trickle from your dick and the urge to jack off increased. She stood, leangt up against the tree panting, as if our of breath, but still her eyes could not take themselves off of your already lust distorted body. "I...I...I've...got to...resist" she said feebly as a hand started to reach down to her bikini bottoms. "Maybe...just...a...little" the hand made its way under the front of the already damp fabric, finding its target. "Ahhhhhh...ah....ah," she moaned softly, as she began rubbing rhythmically underneath her bikini bottoms. Her other hand reached up to her breasts, which she began to lightly fondle.
This was all too much for you to handle, and before you realised it, your hand was on your dick, rubbing it up and down at the sight in front of you. As you rubbed up and down, you could feel your already oversized balls enlarging, filling with new seed. Sam was really getting into it now, still leaning against the tree whilst rubbing beneath her bikini bottoms. If you weren't so tied up yourself, you may have noticed the slight expansion of her thighs or the light covering of chestnut hair beginning to cover her legs. Her waist was also slightly expanding, straining ever more at her already tight bikini bottoms. You may have also noticed that her breasts were slightly bigger, again, straining against their restraints.
You just couldn't take your eyes off of the scene of pure female lust in front of you and with each jerk, your pleasure increased as did hers. "Ah....ah...ah...ah...arghhrrrrrrrrrah" SNAP - as she began to feel the pleasures of the most intense orgasm of her life, her bikini bottoms and bra snapped apart, leaving her now completely naked. Her body was now slightly taller, her thighs visibly thicker with muscle and her slightly swollen womanhood and legs covered with a light dusting of chestnut hair. Her breasts were also larger and her ears seemed slightly pointed.
Watching her orgasm was the last straw where you were concerned. You screamed in bliss as your now significantly larger dick erupted with a thick stream of cum. It was now almost the length and thickness of a horse's but still mainly resembled an oversized human dick. The with each stroke the pleasure from each orgasmic contraction at the base of your dick was mind blowing as a pool of cum formed beside you. As you started to come down from your orgasmic high, you noticed that your muscles had expanded further - making you now look like a well toned jock. The hair on both legs had also thickened, over your already large thighs.
You were so exhausted, after the running, watching Sam's ministrations and giving in yourself, that you began to lay down on the floor, but before you could rest...