Sankaku Channel/internal cumshot

While technically, this tag could refer to any image with evidence of an internal cumshot (i.e. a creampie), it is typically reserved for cross_section images of the actual cumshot. This may be either overlaid on the image itself, placed in the background of the image, or an inset. For images which depict an internal cumshot without such an internal view, the tag nakadashi is generally more appropriate.