Background
I've been in a relationship for 8+ months now, and the trip I'm referencing will be past our 1 year date. These numbers don't matter to me any more (as opposed to 1-2 months into the relationship), but just here in case it helps answerers.
My friends and I are taking an international trip in December for a special occasion, and I would really like my SO to come with me. I told them about it and they said they would look into it.
Due to some recent unfortunate circumstances, they are not going to be able to afford the ticket and prices are climbing every day.
I have already bought my ticket and I know I can buy theirs too, and I would like to, but I don't know how to bring this up.
I know I should be able to talk about anything with them and for the most part I can/do. However, money is usually a tenuous subject1 - regardless of people/circumstances. I don't want them to think I'm trying to show off or that I expect anything in return, or anything of the sort. Nor do I want to add unnecessary pressure to a relationship with a person I'm completely in love with.
Question
How can I go about asking this person if they would be ok with me buying the ticket, with the above thoughts in mind?
1. tenuous subject reason - This has been my experience with a friend and some family before, though not with any previous partners or with this SO.