Too big to ignore

abs ai generated athletic athletic anthro athletic male balls big balls big pecs big penis black hair boy countershade torso countershading cub cub/solo cumming cumshot donkey equine equine balls equine penis erect erection erect nipples erect penis farm glistening glistening body gray fur grin grinning hand on penis jerking off long ears looking at viewer looking pleasured male male/solo masturbating masturbation moan moaning motion lines muscular muscular cub musk musk clouds naked nude one eye closed open mouth orgasm face pecs pectorals penis penis focus pink nipples precum precum drip puffy nipples seducing seducing viewer seductive short hair shortstack sitting smile smug smug face solo sweat sweating testicles tongue out white fur white hair winking young young boy