[ "look at how well things are going for her so far" she is actively waiting for that other shoe to drop. ]

It sounds like you're thinking too much already, actually. You're never gonna get anywhere nailing your feet into the ground like that... I don't think anyone would get the wrong impression from you though, Mark-kun, it might actually be a little thrilling.

[ getting through this parfait... she's gonna split the leftover into each waffle cone ear and hand one off to him so she can have the other. ]

But let's start off small. Make excuses and find reasons to hold someone's hand and be close to them. That's a kind of impulsiveness too. Adds in a little thought, a little planning, but it's purposeful.