anal anal_sex arms_tied balto balto_(film) bound canine closed_eyes collar dripping erection feral forced from_behind_position frown grin group group_sex kaltag_(balto) knot looking_back looking_pleasured male male_only mammal mcfan mounting muzzle_(object) muzzled orgasm_face penetration precum quadruped rape sex smile spreader_bar star_(balto) steele_(balto) tongue tongue_out train_position yaoi