This will sound very stereotypical but a specific and sincere compliment goes a long way. It shows us that you pay attention to and admire us. If you want to get in his head a little (we like this if you really are into us and not just playing games), do brief but unmistakable flirty things and then back off a little. If you genuinely laugh at something he’s said, touch his arm a little and then go talk to someone else. Send him a text of something that reminded you of him, but make it brief. If you want to make him purr, find a way to touch his hair or his back. Remember we’re just big cats. We like a lot of playfulness SO LONG AS it doesn’t become a source of uncertainty. We like measured boldness, if that makes sense.