I think its OK to ask for anything ( barring unethical/illegal stuff). And it's up to the T to decide what they will or won't do.
If my T says she won't do something there is not much to do except drop it and decide if I can deal with her choice. She doesn't make those decisions lightly and stands by them.
I am fortunate that my T really never refuses me anything I ask for. We are very attuned to each other.

I did invite her to my wedding reception this month and really want her to come.she hasn't decided yet. She says she needs to think hard about how it might impact me and our relationship. I was upset at first, but eventually decided I'd have to trust to her experience and accept that she may see potential pitfalls I am blind too. It will be hard if she decides not to come, but I fundamentally believe she is doing what she thinks is best for me and out relationship