Rule 34 Dev - animated ass_expansion belly belly_expansion big_ass big_butt big_penis breaking_restraints buff burping cock_ring cock_worship demogorgon expansion experiment flexing flexing_arms flexing_bicep flexing_both_biceps flexing_muscles foreskin genital_expansion growing growing_penis growth hyper hyper_penis inflation lab macro male_only metal mp4 muscle_gut nighdruthanimations pec_bounce pec_flexing penis_growth pleasure pleasured pulsing reed restrained restraints roar roaring science sound sound_effects stomach_noises stranger_things teeth teeth_showing throbbing throbbing_penis trapped unexpected unwilling_growth video voice_acted willing_growth|9563382368