[He was expecting her to refuse, to tell him she'd rather watch him cook, or fear she'd be in the way, or something avoidant to get her out of it, so her acceptance actually takes him completely by surprise.]
[It's all he can do not to just pull her closer and hug her, because he's just so happy]
You can help me make the strawberry smoothies. [They're not all that difficult, but he just wants to spend time with her, and doing something he loves with someone he loves? There's nothing that could possibly be better. And then they can all eat what they've made together-- and if his smile softens slightly at that thought, of the three of them, finally spending time together... well.]