Ryou is very shy, nervous and bashful so that makes it very easy to capture by force so long as her twin sister doesn't catch on to the fact that she's being kidnapped, but she can also be coerced into being tied casually once she feels comfortable enough to open up a bit. Her short skirt and thighhighs make her an easy target for a skirt-hiking shibari, but her great secret is that she is actually rather healthy under her outfit, so emphasize her chest as much as possible too. Either way ends up being a win-win situation since her actual weak spot is her hips, and they can be rubbed in almost any position. Use a gag that is comfortable but doesn't cover a lot of face as she likely won't stop blushing for the entire duration of the captivity.
