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abs american_opossum animated animated_comic animated_gif anthro big_muscles big_pecs big_penis body_size_growth comic duo equid equine genitals giraffe giraffid growth hi_res horn horse huge_muscles huge_pecs huge_penis hyper hyper_genitalia hyper_muscles hyper_pecs hyper_penis knocking long_penis male male_focus mammal marsupial muscle_growth muscular muscular_male ossicone pecs penis proxol_(artist)short_playtime size_transformation text transformation virginia_opossum