Should I wear lingerie for not really my man?

I’ve been seeing this guy for a few months and we haven’t had a conversation about “what are we”. I’m not sure if he’s assuming we’re just together or what exactly. We started out seeing each other just once a week but in the last month, we’ve been seeing each other like 3 days a week.

He’s been really nice, planning a fun activity once a week, never letting me pay for anything. He’s made a few comments that kind of suggest that we’re a couple.

His birthday is coming up and I was thinking to bring him some homemade brownies and ice cream(his fav. Dessert) and a silly card. I think that’s pretty simple and I think he’d appreciate it a lot. But I was also thinking to maybe wear lingerie for him? What do you guys think?

After his bday I’m planning on having a conversation about what I want, that I want a serious relationship and see how things go then.

But for now, lingerie or no lingerie?