Professor Alden standing in his dimly lit underground lab, his eyes reflecting the flickering overhead lights as he withdraws the empty syringe from the janitor's arm. The janitor, still slumped in the reinforced steel chair, arches his back violently, his eyes screwed shut, his mouth open in a guttural moan as the serum surges through his veins.His body erupts in grotesque, rapid transformation: his muscles swell like overfilled balloons, veins snaking like cables beneath skin stretched taut, his once-lanky frame now a mountain of pulsating, hairy flesh. His cock jolts upward, thick as a tree trunk and impossibly long, smashing through the ceiling tiles in an explosive spray of cum erupt in relentless, splattering bursts.Professor Alden, drenched in sweat and glowing with manic triumph, clutches his clipboard with shaking hands, muttering, "Yes… YES!" as he eyes the janitor’s still-expanding form, already imagining the next subject for his unholy muscle metamorphosis.