rule 34 2016 abs anthro armpits arms above head ball gag biceps blush bondage bound breath clenched teeth clothed clothing cum cum in underwear cum on clothing cum on ground cum on leg cum through clothes cum through underwear duo equine erection erection under clothes gag gagged grey background greyscale hair half closed eyes handcuffs hands behind back hi res kneeling male male only malesub mammal monochrome multiple boys multiple subs muscular muscular male navel nipples pecs pointy ears restrained rov shackles shirt signature simple background speedo sweat swimsuit tank top teeth underwear 2057315