boku_to_koisuru_ponkotsu_akuma loli naked photoshop ryuusenji_aifa sayori smile_(company) transparent_png

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Either that position isn't supposed to be shown on the screen, or (if different parts of the character get broken down into individual images) the nipples were forgotten to get merged to the sprites.
Maybe there are different sets of nipples available. Normal, erect and swollen, maybe pierced.