FURVERT!

abs animal_genitalia animal_penis anthro balls biceps big_penis biped briefs bulge clothed clothing clothing_aside equid equine equine_genitalia equine_penis erection erection_under_clothing flexing fur genitals hair hands_behind_head horse looking_at_viewer male mammal muscular muscular_anthro muscular_male nipples pecs penis pose presenting sheath sitting sketch solo speedo spread_legs spreading swimwear tenting thong topless tush_(artist)underwear underwear_aside vein white_body