aaron_(artist) abs anthro balls bed biceps big_balls big_muscles big_penis black_fur black_nose body_markings canine circumcised claws cum cum_on_hand cum_on_penis cum_string cumshot dog donell erection eyewear fangs fur glasses lying male mammal markings masturbation muscles nipples nude on_back open_mouth orgasm pecs penis pose presenting sheath shy001 sitting solo spread_legs spreading teeth thick_penis toned tongue vein white_fur