Rule 34 Dev - 2017 abs animal_genitalia anthro areola balls big_arms big_balls blue_eyes front_view growth growth_serum hi_res huge_balls hyper hyper_muscles lab_rat mainlion male male_only mammal mouse muscle_growth muscular muscular_male nipples nude pecs rodent sheath simple_background solo standing steroids thick_thighs url vein veiny_muscles|2801453816