Rachel is what you'd call a controllist.

"What?" He says confusedly as she takes his hand of the steering wheel, leaning back in his seat to look at her. "I'm not uncomfortable. I'm just not used to taking care of anyone other than myself." Unless it was sexually, then he'd 'taken care' of a lot of women in the past... "Just let me buy you a slushie. I've done it before. I'm fine with it," he shrugs at her. Maybe there had been some hesitance before but he wants to a good boyfriend and good boyfriends buy shit for their girlfriend. "Stop being dramatic and let me drive," he gives her a teasing smile before leaning in and giving her a short kiss.