2017 abs after_sex all_fours anthro anti_dev anus armpit_hair ass_up avian ayden_(brogulls) back_muscles backsack bailey_(brogulls) balls bathing beach beak biceps big_balls big_muscles big_penis bird black_feathers brogulls brothers butt chest_tuft comic crescent_moon cum dialogue duo ejaculation english_text erection eyes_closed feathers grey_feathers hand_above_head hand_behind_head hand_holding hand_on_shoulder hi_res hug humanoid_penis incest invalid_tag looking_pleasured lying male male/male moon muscular muscular_male naughty_face night nipples nude on_front open_mouth pecs penis penis_size_difference perineum pink_nipples pubes raised_leg romantic_couple sand sea seagull seaside sibling sitting size_difference smile standing sweat text thick_penis thumbs_up tongue tongue_out towel triceps tuft vein water wet white_balls white_feathers white_penis