Re: RLY!?!
Mate, none of what you said above is cool. If you're delivering stuff to someone, serving them food, any kind of day-to-day thing, taking their phone number and texting them weird flirty stuff is awful. The number was provided for business purposes, not to set up a date.
It's one thing to ask a person for their number in a social setting. It's another to delve into a customer record and pull out a contact detail and pester them.
Now imagine this happening every week - it could be on twitter, uber, just eat, work email. It gets old really quick and it's just creepy and sad. If you want to ask someone out, do it properly.
C.