If you do the same to Luna, she gives you a confused look and lets you do it anyways, even if her face isn’t as pliant.
But you have to deal with looking into those deep, soulfull eyes.
Twilight just makes strange horsie noises and squirms a lot.
I feel this wouldn’t happen with Celly. I think she would mostly just talk on ponysal space, and why it is important. Sorted like a little kid who hit another over a toy or whatever.