Just what part of that rack is "boyish"?
She's always been more on the feminine side, but it seems like there's barely any tomboy left in her body or mind.
Your condom remark made me of this one... I think most of the commenters here would LOVE this R18: Nee-chan no Tomodachi / My Sister’s Friend. It's probably one of the most wholesome hentais you could ever read.