How can I buy more time to spend with my crush?

So there's this guy i have a crush on and we are good friends, not the closest but still. He recently called me because he has a thing of mine and he wanted to return it. So i agreed to meet up with him in front of our school and do i just see him and get my thing and say byebye? What else can i do so that i can spend a little time with him? I mean not something too big like "drag him to an amusement park" cause he's just there to return my thing right? But something little that will make our meetup longer and more interesting.

How can I buy more time to spend with my crush?
Post Opinion