[He can feel his heart swell seeing Lumine so excited about her flowers. It's adorable to him how this is such a passion of hers, and it makes him happy to see her happy about it. Maybe not now, but later on in their relationship, he'll have to do something for her to help with her garden...]

I can't wait. I'd like to decorate my home a little more with some greenery, and I think some flowers are a great place to start, if you'll allow me get a few of those arrangements.

[And he'll proudly display them for all to see and gush about how Lumine was the one that made them. Maybe a little arrangement for his desk at the office, too.]

But, Paimon can't come over and knock them all down, haha.