"Sure, I'll take a piece."
Keep driving and be sure to say thank you after getting the gum.
"Sure, I'll take a piece," you say, keeping one hand on the wheel as you do so. "Thanks." You pop it in your mouth and start chewing. Hmm. Pomegranate. She pops a piece in her own mouth and starts chewing. Hmm. Almost seems like an excuse not to make conversation. You drive on for a bit, swishing through the water pooling near the gutters, and Petra takes out a little notebook from her suit jacket, angling it away from you as she starts to scribble. Given the conditions, you're keeping your eyes on the road more than usual, but you catch her taking quick glances at you or out the window every so often.
You start getting lost in the act of driving. Just something about the rain; the sereneness of the sound, the extra attention needed. It's getting pretty dark pretty fast as the clouds continue to thicken in the evening, and soon enough you pull into the sleepily-lit neighborhood your app is pointing to. Sure enough, there's a duplex, right on target, a blue two-story affair divided left and right. You stop at the curb and look over to see Petra looks a bit lost herself, taking a second to stop scribbling after the car stops. "Hmm? Oh." She stashes the notepad back in her pocket and removes her glasses, stashing them back in the case. "Thank you for the ride."