Koakuma is considered a succubus for a very good reason. She readily accepts being tied up when asked and will only resist when taken by surprise if it's done by a library intruder. She continues to flirt and play along no matter how she's tied, so feel free to experiment with whatever she likes and have a good time. For even more enjoyment, capture her on the night of a full moon as that is when she really wants things to get naughty. Keep some wing polish handy for her as well since she loves a good buffing.