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2boys 2males 2men angel angel and devil angel boy angel wings artist signature bandage bandaged arm bandaged leg bandages biting biting neck blood boy only boys bsd bungo stray dogs bungou stray dogs chuuya nakahara clawing clawing back closed eyes color dazai osamu demon demon boy demon horns demon tail demon wings heart symbol lex dark male male/male males only missionary missionary position missionary sex nakahara chuuya osamu dazai penetration Rule34 scar scars scratching scratching back Search Engine Imageboard tail tail around arm tail grab tremble lines trembling twitter unseen penetration