I don't see any issue with checking in oocly with the player of the person who is potentially at risk of being creeped on to see if they are ok because the poses are throwing up red flags for them the way they are for you, or with intervening icly if it's IC for your character to do so, or with some combination of the above. IC is IC, but that doesn't mean it's impossible for we as players and writers to perceive what is happening and have ideas about what it could mean.
That said, I've charged in and +requested about IC/OOC creeping before on another party's behalf because we are socialized to not want to be a bother about things and many victims of grossness find reporting hard. With logs, it's still effective! Without logs it's just gossip.