4boys anus artist_name ass bara black_hair blush brown_eyes clothing_aside cum cum_string erection foreskin fundoshi fundoshi_aside gangbang golden_kamuy group_sex hand_on_another's_ass hat japanese_clothes large_pectorals large_penis leg_hair male_focus male_pubic_hair male_underwear male_underwear_aside military_hat multiple_boys muscular muscular_male open_mouth pectorals penis pov precum presenting pubic_hair scar scar_on_arm scar_on_chest scar_on_face scar_on_mouth scar_on_nose short_hair solo_focus spread_anus spread_legs sugimoto_saichi teeth thick_thighs thigh_grab thighs uncensored underwear upper_teeth yaoi zink_(zink_mchn)