If Asura HAD to flirt. Like gun to his head life or death, how do you think he'd go about it. Asking for a friend.
To be honest I can't imagine him flirting with someone even under the threat of death, but if he did, it would be the strangest, awkwardest and literally insane set of words he chose. He would absolutely treat flirting like a hostage negotiation....
I imagine he would spend like... twenty minutes trying to figure out the safest compliment and still end up saying something not very appropriate
I don't think he's good at flirting at all, so he's like, uh, for example:
"....I have decided not to perceive you as an immediate existential threat." (This is the closest he'll ever get to saying "I like you")
It probably also depends a lot on WHO he should flirt with.
P. S. You're also asking a person (me) who doesn't understand a damn thing about this as well as Asura, so yeah....