I have been having sex since my sister-in-law invited me to have sex a few days after we met. I lived with my sister-in-law then, but we didn't have any conversation. No communication as a family. Just for sex. When I asked my sister-in-law what she was thinking, she said one word... "Because it's embarrassing...". It turned out that his shy attitude was just a misunderstanding, and he was just shy! Oh, isn't this sister cute!? Even more adorable!