His enthusiasm has her smiling widely, and she tilts up her face to receive the kiss. This seems like the perfect way to go about things. No labels or increased expectations, except the being exclusive part.

"Good," she echoes, holding his hand a little bit tighter. "I am glad we talked about this." Because now she feels a lightness to her body, like she could go off skipping or something ridiculous like that. (She won't.)

"And, you know, we can talk about important things like this whenever." There's a pause as she exhales a short laugh. "I am sure we will be quite awkward about it, but I trust you, and I value your opinion. I like having talks with you."