She preferred wearing the thong under the garter belt instead of over it because she thought it looked better, but that required unfastening the stockings in order to slip it off if he wanted to leave the garter belt on, and he always did. He didn't mind, but it did slow down the process a bit. This time, he'd circumvented the issue by choosing a thong that tied on each side. Now he yanked on the strings and pulled it right off her, leaving the garter belt in place. He smiled because he always took satisfaction in coming up with a successful work-around.