“Dad keep pumping. It’s starting to work,” I moaned while on all fours. My dad kept pumping his dick in my muscled ass. I felt the drugs he just injected into me starting to take effect. My body starting to burn from the obscene amount of testosterone he just injected into me.
“Ugh dad keep going,” I cried. I pushed my hard ass back against my fathers pulsing dick. His thick cock spreading my already open hole. I grasped ahold of the carpet feeling my grip tighten as my hands began to grow numb followed by the pins and needles that came before the growth started.
The roids always worked from the outside in, starting with my hands and feet and slowly creeping its way in. Up until this point we had never done this large of an injection, but I was tired of waiting. My dad was growing the perfect fuckboy. 100% muscle beast and slave to the man who created him. And I wanted to be his beast now before I went off to college.
My forearms began to pulse and with every pulse they grew in size. My biceps and triceps growing to the size of bowling balls. I left one arm up and flexed for my dad. Feeling my bulging biceps tight underneath my skin.
“Fuck dad their huge,” I said as I posed. My dad continued to fuck my ass in gusto. Enjoying the sight of his creation.
“Boy your gonna be huge. Your gonna be a fucking monster at school. Imagine what everyone is gonna say when they see this giant of a freshman walk onto campus. Every fraternities gonna want you to be their brother. Every coach is gonna want this beast on their team. Your gonna be a god among men. But little do they all know your my fuck toy,“my dad said. He grabbed onto my growing thighs and squeezed. “Damn boy your not gonna be able to fit into normal clothes anymore. These fucking tree trunks. Good luck finding anything after this shit turns permanent.”
His hands traveled up and down my thighs and then moved up to my solid ass. “Mmmmmmmm this ass is starting to grow too.” He smacked my growing cheeks with a loud SMACK. He grasped each cheek in his large manly hands and spread them apart to allow his cock deeper into me. God he was so thick, and with these treatments his dick only gets thick. I felt both of my cheeks begin to balloon outwards. I looked behind myself at my dad and the new basketball booty I had. Fuck it felt so good, and they were so big. I bet I could squat well over 400 now. Not only did the drugs grow my ass but seems as though it increased the size of my prostate too. God I was gonna cum already.
“Daddy slow down your gonna make me
Cum,” I groaned. I pushed my new bubblebutt deep into my Dads crotch. God i felt so full.
My Dad leaned onto my back enjoying tightness. His hands explored my expanding body; His hands gripped my rounded deltoids, scrapped his fingers into my broad backside; and his hands ended at my hanging pectorals.
His fingers pinched and pulled on my nipples, while I elicited moans of pleasure in repose.
“Boy these tits are getting huge. I don’t think we’re gonna be able to fit these babies in your shirts either,” he whispered into my ear. The thought of outgrowing all my clothes pushed me even closer to orgasm.
His hands moved further down my frontside and his hands grasped my dick and balls. My balls reaching the size of baseballs, and my dick at least 12 inches. One hand massaged my engorged dickhead and the other rubbing up and down the shaft.
“Dad I’m gonna cum. Please stop.,” I moaned. He began to start thrusting again. I felt his own balls tight against my ass. God he was about to cum. “Dad keep going. I want your cum in me. Daddddddyyyyyyy,” I screamed. My own body betraying me and orgasming before my dad did. My dick shooting gallons of cum onto the floor. Soaking into the carpet. My dick unloading deep into my muscle ass, more than I ever thought I could carry. I continued to cum long after my dad finished. I looked underneath me, and my dick was continually oozing out cum. Long thick globs landing on the carpet. My mouth salivating, waiting for when I finally finished and I would be able to slurp up all that cum, and have that extra protein grow my muscle even larger.
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