2boys, age_difference, bara, beard, collared_shirt, facial_hair, feet_out_of_frame, greyscale, kyosuke, large_pectorals, male_focus, mature_male, mike_zakarius, monochrome, multiple_boys, muscular, muscular_male, necktie, off_shoulder, open_clothes, open_shirt, pectorals, reiner_braun, shingeki_no_kyojin, shirt, short_hair, sidepec, stubble, teacher, teacher_and_student, undressing_another, yaoi