<human>: Can you summarize the given text in a few sentences?

I'm 24M and she looks around my age, maybe a little younger. She works in the sushi place across from where I work. I went in last night by myself and she questionably glared at me and looked outside expecting someone else to be with me. I let her know it's just me and she set me at the bar. I made sure to always smile and make eye contact with her when she helped me, and she returned the looks.

I tried not to be overly checking her out as to not be a creeper. Since I was sitting at the bar I would just watch the Chef's make the sushi and "follow" the food as it went from them to her, where me and her would notice each other again. I would smile, she would smile, and then I go back to watching the Chef's as she delivered the food. 

I'm planning on heading in next Tuesday at around the same time and chatting her up a little more beyond the scripted conversations you have with a service worker. Is it too forward to give her my number on a napkin? I feel like giving her my number would be better then asking for hers in this situation. Or should I ask for hers? If she has a boyfriend I can just leave my number and tell her something like boyfriends don't always last and if she changes her mind to call me.

What do I do about returning to the place after giving the number? Just come back as a normal customer? Even if she doesn't take it? Or doesn't call? I don't want to be the annoying customer who always hits on you but it would be nice if I remained in her head as an option.
<bot>: Should I give the cute waitress my number on a napkin? Ask her for hers instead? Continue eating there after giving her my number?