Rule 34 Dev - 1boy 2015 abs anthro black_and_white bondage bound claws clenched_teeth coat collar comic cuntboy dragon fangs fear fully_bound gag gagged greyscale horn human intersex japanese_text lab_(disambiguation) laboratory larger_anthro larger_male male male_focus male_only mammal metal monochrome muscular navel nude panting pecs pussy reptile scalie sharp_teeth simple_background size_difference slit slit_insertion slit_penetration slit_play smaller_human smaller_male solo_focus spreader_toy spreading_slit steam teeth text translation_request 竜族生態調査班|2984874880