Update you are replying to:
Wow, thanks for the detailed feedback! I can really see what you're describing here but... I think it's a different scene? I like forceful restraint scenes but it wouldn't have felt very realistic to me in this context. I wanted a spanking that would have felt perfectly plausible in my own time at university - with an awkward, embarrassed student who is eager to please and knows they've messed up. In that context restraint isn't necessary and in fact would detract from the psychology of a student who's ashamed of their own disorganisation and desperate for a good grade.