Is it odd for a guy to be curious and ask to try on one of his girlfriends pretty bra & undie sets and?

then dance around in them and kind of play with his stuffed bra ?

I think Chrissy IS being serious. Lots of guys do it, usually for a laugh (or so they say!) some get a turn on from it. I think it would have been pretty noticeable if your bf did get aroused by it;-)
But even if he did, it's a pretty harmless kink. Some couples really do enjoy that kinda thing together.
Believe me, there's a lot weirder stuff going on!

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