Funny. I'm sure there will be some getting "comfortable" with the SO for you JR. But, just do what feels right, be yourself.
My wife and I have been together 12 years, I've tried purchasing things for her from VS, and other places. She told me a long time ago... what's the purpose of buying all this fancy underwear when you want to take it off anyway. Don't buy me any of that crap - I'll wear it for like 10 seconds.
I'd say we're past the honeymoon stage, and the trying to impress each other stage. A little excitement is nice every once in a while, but again, just be yourself - don't be intimidated, speak up about what you like (just not too loudly).
Enjoy it.