Is it weird that my sister seems okay with me seeing her in her underwear?

I was helping her when she was trying on dresses and she just causally slipped one of them off without even thinking about it, I saw her in her underwear and she wasn't embarrassed or anything.

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Strongtea · 22-25, M

No, it seems fine, there’s girls on my college course that have answered the door to me in their underwear and then just hung out like that when they invited me in. I was kinda embarrassed at first but they seemed fine so I just hung out. Just the same as a bikini I suppose.