Rule 34 Dev - 2020 anthro balls balls_expansion big_balls big_muscles big_pecs big_penis black_nipples bobert canid canine clothed clothing erection expansion fist flexing genital_expansion genitals green_background grey_balls grey_penis growth helium_tank holding_object huge_balls huge_cock huge_muscles huge_pecs hyper hyper_balls hyper_genitalia hyper_muscles hyper_pecs hyper_penis inflation looking_at_viewer male mammal muscle_growth muscular muscular_anthro muscular_male nipples pecs pecs_expansion penis penis_expansion plantigrade simple_background small_head solo standing torn_clothing underwear underwear_only|5008039896