2boys, anus, arms_behind_head, bara, bottomless, hand_on_another's_chest, handjob, head_out_of_frame, kneehighs, lying, male_focus, mature_male, multiple_boys, muscular, muscular_male, on_back, out_of_frame, penis, perineum, red_legwear, sketch, socks, solo_focus, spread_legs, testicles, tongue, tongue_out, trembling, yaoi