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2d_animation 4:3 animated animated_gif anthro big_breasts big_butt boss_monster_(undertale)bovid breast_expansion breasts butt butt_expansion caprine clothing expansion female frame_by_frame growth huge_breasts huge_butt hyper hyper_breasts hyper_butt low_res mammal short_playtime simple_background solo thesneakyzone thick_thighs toriel undertale undertale_(series)white_background