How to flirt text? without being so obvious?!?

theres this dude in my cl, well my friends think he likes me but i dont. he stares and we text everday and talk on the phone for like 2 or 3 hours till 12 or 1 am on a school night. so its hard to make conversation all the time. i need subtly ways to flirt. not hey baby or anything ual. he is very shy. or no i was thinkin of you. we're from the south and like to go huntin. he goes like every afternoon and i go on the weekends. so that kinda starts convo. but i need ways to flirt