"Can relationships work between so-called NT people and those with autism?"
I'm absolutely sure that they do, but it probably takes more patience and kindness on both sides than it would with just two NT or ND people. I might be wrong though.
"Does masking leave you feeling literally exhausted"
Yes! Oh god yes. It's thoroughly mentally and physically exhausting for me. I lie down for hours at the end of each day.
"If you could click your fingers and no longer have autism would you?"
On many days, yes, without hesitation. I hate a lot of the sensory issues which make my life hell. But then that would also remove "me" and would really be a form of self-destruction or even suicide in one way. So on my better days, no. My husband needs me around too much.