Some sort of hints for this would be nice. Like, all the secrets I've found so far had something to do with the time in the animation and/or the cum meter, but I don't know whether all of them overall are like that. Are there any that involve clicking the portraits? Because I'm still missing two, presumably Sounding and the cum animation for Sounding. I would assume it has something to do with the Stop action, since Tentacled, being next to Tentacle, was unlocked through the Tentacle animation. But I can't figure it out.
Hints could be something like what animation it's obtained through, or what it is related to (like clicking or the cum meter being full/empty or spending a lot of time in the animation.)