Quote Originally Posted by Ranai
Hi, I have changed 'apprehension' to 'anticipation', as this seems to be the more general and appropriate expression. (Though among expressions of anticipation, I find apprehension in particular incredibly erotic to observe.)

Thanks everyone so far!
I think apprehension is the appropriate word. To anticipate gives the impression you know something is going to happen. Apprehension has more a feeling of not knowing what is going to happen. My partner might anticipate a scene but if I am up to speed she is going to be apprehensive as she won't know what I have in store for her other than its going to be within her hard boundaries which gives me a lot of leeway.