How do I ask for a second hangout that’s just casual without leading him on?

I (29F) went on a first date with a guy (26M) and it went really well. We got dinner, had good conversation, laughed a lot. Ended up making out in his car for a bit (nothing more). He texted the next day saying he had fun and wants to see me again.

Thing is that I don’t see anything serious with him, he's nice but we both want different things. He’s younger and plans to move out of state for grad school, I’m more settled in my career and city and not really looking to start something that’s going to fizzle once he leaves. The chemistry was still solid and I’d be down to see him again just for something casual, like another chill night that probably ends in bed.

I just don’t want him thinking this is going somewhere since he seems like a relationship guy. How do I text him to hang out again without giving the wrong idea? Should I just say it straight up like “hey, had fun, down for something casual if you are”? Or wait till we’re together and say it then?

Don’t want to be a jerk but also don’t want to waste his time.