is he trying to make her feel comfortable with embarrassing things, or is he using her embarrassing moments to have fun with her, if this was a typical type of story the flag would be up for some very embarrassing lewd moments for Shizu-chan in the future, between two flowers, and an insect.

ほうほう…一旦外して妹から聞く…と。
積極的なお兄ちゃんらしくない手法？(笑)

静ちゃんの恥ずかしいこととは一体……？((o(´∀｀)o))ﾜｸﾜｸ