Pushing for something mid-scene that you said early on that you didn't want to/aren't comfortable doing. When your endorphins are high, you're more likely to cross a boundary you'll regret later, which is why negotiations should always be completed before play begins. If it goes well, there's always room to renegotiate next time if trust has built up by then.
I also find someone who's unwilling to consider the particulars of your daily life rarely makes a good play partner. Workplaces, school situations, housing considerations, etc. can make tasks harder for some than for others. A play partner doesn't have to be a mind reader, but if you say, "Hey, I have a concern about how this will affect other parts of my life because I have to deal with ____," they should be able to adapt or replace the task without a fuss, and without accusing you of questioning their authority.
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