General: unseen character
We may know about the character's presence because we see what they are saying (the most frequent case), because they are throwing something in the frame, or we may see their shadow, cum or object reaching into the frame (such as a leash or whip they're holding). The mere actions of the characters in the picture do not necessarily count.
The following do not qualify:
- People being talked to over the phone. (if we see them via a video_call, they're in the picture).
- Semen on the body after_sex (semen being squirted from offscreen counts).
- Characters in the picture looking at or addressing the viewer.