1boy, animal_ears, arknights, back, back_focus, bara, black_male_underwear, blue_eyes, butt_crack, from_behind, furry, furry_male, hinokumo_f, male_focus, male_underwear, mountain_(arknights), mountain_(book_reader)_(arknights), muscular, muscular_male, ponytail, scar, scar_across_eye, scar_on_arm, short_hair, solo, tail, thick_eyebrows, tiger_boy, tiger_ears, tiger_tail, topless_male, underwear, white_hair