Ciel is one who can be very difficult to approach, but it's even harder to take her by force, so it's only a good idea for those with a lot of patience to try and do anything with her. She will only accept a bondage session from people she trusts explicitly and can rely to not break their word. Caution also needs to be taken on what materials are used since she does have bad memories of being experimented on when restrained, so chains and cuffs are a very bad idea. Rope is a good choice to use a skirt-hiking shibari as she does have nice legs with her back being her weak spot. She isn't so picky about what gag is used on her, but it's better to err on the side of caution to remain on her good side, as she will hunt down those who hurt her.