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anthro balls barefoot biped blueballs border buckteeth clenched_teeth clothing collar erection eyes_closed feet flat_colors fluffy fluffy_tail footwear genitals legwear male mammal masturbation nude pawpads penile penile_masturbation penis reclining rodent sciurid scrunchy_face simple_background sitting sockballs socks solo spiked_collar spikes spread_legs spreading tail teeth toony tree_squirrel wet wet_clothing whiskers white_border