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As the morning sunlight filtered through the window, my grandson strode into the living room with his massive frame. Day by day, his muscles seemed to grow even more outrageous. At first, he was just a kid who worked out a bit, but now his biceps are thicker than my thighs, and his chest is as wide as a door. The veins popping out on his shoulders and back make him look like he could outshine any pro bodybuilder. "Grandpa, try this supplement," he said with a grin. "I’ve been taking it, and it’s done wonders for me. It’ll make you feel strong as hell." I couldn’t help but smile back. "Alright, if you say it works, I’ll give it a shot." I swallowed the pill he handed me. It had a slightly bitter taste, but it was from my grandson, so I trusted it.

Dressed in jeans and a hoodie, I stepped out to walk around the neighborhood. At first, I just felt a slight warmth in my body. But then... what the hell! My arms started twitching and swelling up. Veins bulged under my skin, and my biceps ballooned like basketballs. My chest stretched the hoodie so tight it felt like it’d burst, and my back flared out into a perfect V-shape, the fabric tearing with a loud rip. My thighs thickened into pillars, shredding my jeans. I went from a scrawny 65kg to what felt like a 250kg muscle-bound beast in the blink of an eye. Every step made the ground shake, and I could feel my muscles flexing and grinding against each other. People passing by gaped, jaws dropped, and I muttered, "W-what the hell is happening?!" in a panic.

But that wasn’t the end of it. Suddenly, a scorching heat surged in my lower body, and my cock started twitching. In an instant, it hardened and swelled to the size of a damn telephone pole. My jeans were so tight they could barely contain it as precum started gushing out. Warm, sticky fluid trickled down my thighs, and an intense pleasure gripped my entire body. Then, that massive thing throbbed with unbelievable force, practically filling my vision. "Ohhh... I’ve never felt anything like this in my life..." I groaned, unable to hold back the moans spilling out. "No, no, calm down!" I tried to press it down with my hands, but it was no use. It pulsed a few times, and then... WHOOSH! An insane amount of cum erupted. It was like a fire hose had burst, the sticky mess soaking the ground and splattering everywhere. Mixed with precum, it leaked through my jeans, leaving my legs trembling and my breath caught in my throat. People around me shouted, "What’s wrong with that guy?!" and I, face burning red, stammered, "S-sorry! I don’t know why this is happening!" while trying to cover myself. But with a 250kg muscle-bound body, moving quickly wasn’t exactly an option.

Kid, what the hell is in this supplement? You said it worked wonders, but this is insane! The muscles are great, but this cum explosion... And it’s not stopping. I’m gonna have to jerk off a few times when I get home to calm this energy down. Should I try another pill?