This is probably a dumb question but what exactly is the etiquette for MSOG. Is it rude to ask or is it YMMV.

Most Kgirls I have met will happily give you a second round providing half the time you booked is still left.  If you used 45 minutes of your hour and only have 15 minutes left, they have to work too hard and many will not be up for giving it a try, because they can't run overtime like they used to when the breaks between customers were longer.  If you only have a little time left, take the massage instead and book 90 minutes or two hours next time.  It also helps if you tell them when you arrive that you want to go for two pops.  Then they will help to manage the time accordingly.

Thanks for the advice. I will try letting the next one know. I am aslo very mindful of the time. I do ask on occasion but the top tier girls offer without needing to ask. There was one time I did ask and I had to cut the session short because she seemed rather annoyed. I just want to make sure I am not being rude.

This may be little off but one particular provider tried to finish me off early by taking me to shower at 40 min mark or so. Then in a shower, she noticed (my woody) I was up for second and she took me right back to bedroom. When done, she asked me and made sure I unloaded. She also told me that "majority" of the guys do it once and she thought I was one of them.

an hour or more, then you will rarely annoy a Kgirl as long as there is reasonable time left.  Indies are another matter.  Many don't do MSOG in one-hour sessions.