Also, I don't entirely agree with BugDevil. Again, if by "passionate" , you guys mean being rather lewd, Touko has been shown to be pretty horny many times, and not just out of coping or distress. Chapter 9 "Do you want to listen?" , chapter 16 and chapter 20 are the first to come to mind as examples.
Then again, I am not sure if we all mean the same so maybe my comments aren't particularly appropiate.
I do acknowledge that my viewpoint may be slightly skewed, but let me explain it as best as I can.
Context matters.
Chapter 9: She was nervous and shy. Far from passionate. Unless we define passion as being excited...
Chapter 16: Actually one of the prime examples of Touko being frustrated and coping. She has been holding back from being affectionate with Yuu for a while and wanted to be rewarded with something she should not ask for due to their agreement. In a way she was not satisfied with their arrangement, despite enforcing it herself. This frustration culminated in the french kiss.
Chapter 20: Staring at Yuu doesn't matter. The part where they all slept in the same room and were glad they were three people so they wouldnt do something foolish is probably the only naturally passionate thing there.
Now look at moments like the one in chapter 28... Touko is confused, frustrated and emotionally unstable because her worldview got challenged and she doesn't know what to do anymore, so she aggressively asks for a kiss and wants to drown that stuff out with her anchor... Yuu. And that is what Yuu has always been until the play. An outlet.
That is of course oversimplifying it, but my point stands, Touko has never been overly passionate outside of choice moments and often those are an emotional reaction to circumstance. Both Touko and Yuu (more out of necessity) have been very subdued and balanced in their show of affection. A Touko that isn't insecure about Yuu leaving her or being loved would not have the need to be overly aggressive or passionate. This is the fluffy, floaty love that they have always sought.
Which doesn't mean they won't be getting to a point where they tongue wrestle in Yuu's bed again or do other outrageous things like intertwining both sweaty hands at the same time. I just never perceived their relationship as excessively dramatic and passionate.