I've been thinking recently, seeing multiple girls get violated simultaneously is nice, but what if the tentacle pit can only violate (or only bothers to violate) one or some of the girls at a time while the other(s) are forced to watch? Normally you'd think of the unviolated girls watching in horror but if the scenario goes on long enough you could have mindbroken girls being forced to wait their turn. You could even have both mindsets applied to different girls at the same time. I imagine this must have been explored before but I can't think of any examples.