So why rate adult?

because hopefully the transformations will eb adult - I will change them to mature

I saaaay... you turn him intoooo... something much less brutish. A female deer... an amply curvy and giggly deer.

hmmm for a him maybe lose all the muscles make him a complete geek/nerd type but on the side of preppy and always following rules or maybe turn him into a true thug/chav like a big time black or hispanic or some other race gang member. less evil side ummm you can always turn him into a older guy a little past his prime like maybe a middle aged cop or military drill sergent

His wish is to be huge, so let's grant it. Make him start to bulk out in muscle but also with a huge hairy ball belly gut that pokes out from beneath his tight tank top. He tries to pull his shirt back over it, but that hairy gut won't have that and it balloons out even more. His butt starts to grow too, poking out like a fat plumber's butt hanging out. He tries to pull that up, but he's already grown a thick tail and his hair has become a razor-back like mane running down his back to the tip of his tail. he worries as he just gets fatter and fatter, although his body seems to be adding muscle too. His shirt gives way to hairy man boobs and an enormous gut, making the poor guy completely embarrassed, causing him to sweat, stinking up the place. The once chiseled features have softened and he now has a double or triple chin, covered in stubble. His pants eventually give way, but oddly enough he's grown another set of legs, to help support his huge bulk, although that just makes his ass twice as huge. His balls drop huge and heavy as his dick becomes an oozing spigot. He looks and feels like a hairy balloon about to burst and he has a new subconscious submissive need to feed his fellow muscle beasts his sweet, sweet nectar.

Hmmm... how about, he remains muscular, brutish, and strong... but as a female. How about he becomes a tigress, with big, lovely breasts, but retains his wild, brutish nature, powerful, yet beautiful, monstrous, yet sensual. Maybe he doesn't just become a tigress,maybe whoever or whatever changes him, makes him the ultimate warrior so that he, now a she, can also give birth to more warriors, maybe she also has organic blades growing from her elbows, her knees, and huge, unnaturally large fangs?

As the stud walks home from a particularly intense session at the gym, he decides to take a shortcut through a series of back alleys behind a seemingly abandoned warehouse. Pausing to investigate a strange pool of slime, he is taken by surprise as something thick and slimy burrows through his trousers and begins crawling rapidly up one of his powerful legs. Confused and naturally alarmed, Jarod hastily removes his pants without a second thought, just in time to see a grotesque parasite like creature slip inside his tight rear.

As his eyes widen in fear, he lets out a futile yell for aid as yet another parasite drops from above, smearing a strangely intoxicating fluid all over his chiseled features before slipping into his mouth. For a few moments, he simply stands there in shock, only for his entire body to begin secreting the slimy substance as though it were his sweat. A feeling of pleasure washes over him, his muscles swelling as his flesh peels away to reveal hardened scales. Gradually, his features shift to become more reptilian, whilst writhing tentacles burst out of various parts of his body, each eager to plunge into something! His phallus would become the most prominent, already ejecting familiar parasites to infest others.

Sort of a reptile/alien hybrid thing. Heh...

MutableBeast is making some good decisions all around.

I've posted my idea for him in the group pic you made for him and the others. He's the second one I commented on.

So, yeah, Jarod is gonna get bigger muscles. But what really grows are his bones. They get so big that they take over his body and they give him a demonic form (which he doesn't mind at all!) Big fangs, big horns out his his head AND shoulders, and nasty bone talons that replace his fingertips and toes. He also gets an boned penis (and constantly makes boner jokes because of it.) So Jarod comes out looking like a zombie with bones over muscles but he's probably the most ecstatic over his new bod.

Instead of Jarod growing bigger muscles, how about his limbs, torso, head and neck all stretch out, all of his bulk pulled out. He grows two more sets of legs and his ass expands into an abdomen with pinchers something like an earwig. His torso remains somewhat human with arms like a taur, but his arms are really stretched and his fingers have grown together so that only three very long digits remain. He loses all his body hair and his face elongates and his eyes grow out on stalks, and two horns grow out of his forehead and curve back. His genitals retract into his lower body. Sort of an insect-taur.