Your brother looks at you from the side and you can see that while you were staring at your dog's growth he had done some growing as well. Tiny dog ears had apparently sprouted out of his scalp but they could easily be mistaken for unkempt hair, and his tail that you could see was small enough to be hidden. However, his, or hers I guess, breasts were a different story. They were a few cup sizes bigger than a DD and were currently acting as his pillow on the ground, his shirt had bursted.
You look along his feminine arms and legs and come to rest at where a large bubble butt had burst his pants and underwear. A giant behemoth of a penis was standing up at attention right where his pants had split. 10 inches of bonified manhood still stretching upwards to 13 inches aiming right towards his breasts. It finally stops at two feet and is encased solidly within her breasts, where he begins to massage her manhood with her huge tits. Her cum shoots all over his breasts.
Your dad turns to you, "We were almost too late to save any part of him, but apparently the antidote combined with the Zpunk caused his penis growth to skyrocket."
You stare at him as he hungrily fingers his own cum and eats it right off of her own breasts. You notice that as she does this her breasts perk up a little and seem to fill out a little more. The next time she does it her height seems to expand and her butt gets a little bigger and rounder. Apparently the combination of antidote and partially developed Zpunk had more side-effects than your dad had initially told you.
Your dad leaves the room and you follow her. "What was that?"
"An unexpected side-effect, nothing more."
"But is it dangerous?"
"No, her muscles should develop to keep her from harming herself and it shouldn't affect you unless you let it."
Before you can ask what she meant by "let it" she turns on the television and you can see a newslady begin giving a news report.
"The Zpunk epidemic is still spreading as more and more news come in of numerous Zpunk spills into water mains are coming in and more areas are affected by Zpunk in the air. We suggest that any and all unaffected residents stay in their homes and only drink from bottled sources of water." She drinks some water. "Furthermore, if you are in any of these...*gasp*...areas..." With this she collapses on the desk in front of her and you can see whiskers and huge breasts develop before your dad turns off the television.
"Son, you might end up being the only 100% male in the world at this rate." The thought makes you shudder in fear and excitement at the same time.
You both go upstairs only to find that "Spotty" has woken up and started having sex with your brother. Both of them have grown with your former pet now having breasts more than three times her original size and your brother sporting breasts at least two cup sizes bigger. Your bro, or sis now, is 8' tall and while your pet has only grown a few inches her butt is now even bigger. They separate and you can see that your sis's penis is now 4 feet long erect. They both climax and your sis falls asleep. Your pet stays awake though and begins shrinking. She is now a mere inch taller than she was beforehand and her breasts have shrunk down to only one cup size bigger than right after her growth. Her butt and hips shrink to her post-growth size and stop there.
She gets up and wanders over to you, fully naked. "Master, can you pet me?" Her tail swishes expectantly as she stands in front of you. She doesn't stop massaging her breasts though and almost seems to be inviting you to stroke them. You do so quickly and she smiles at you in appreciation as you slowly knead and massage her breasts. She then walks over to where her food bowl sits, "Spotty" proudly displayed on the side. Well, now's a good time as any to get this out of the way.
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