Tomoyo is a lot stronger than she looks and many people will attest to that, so one definitely does not want to try and take her by surprise without being kicked countless times. However, she will deign to be tied casually after a bit of work in earning her trust, so take the safe route. Tie her in a tie that emphasizes her legs and chest, but it's more important to give her a gag that highlights her hair as that is her best feature and what she enjoys having touched the most. She'll remain calm so long as her hair is treated nicely and she isn't touched in naughty ways. So long as she's treated well, she'll show the feminine side she's trying to develop.