[To be honest Starfire had her answer after the first few moments, but... she's also enjoying this so she does draw it out a while longer, at least until she's successfully taken in two or three of the languages he's familiar with- at which point she breaks the kiss almost as casually as she'd initiated it. Her expression isn't entirely readable when she smiles back and lets go.

And then, with some effort, in French-]

It would seem that we are not from the same timeline. [Before switching back to English, after a beat, with both surprise and amusement.] But it would also seem that you are well versed in Earth's other languages. Robin did not possess the knowledge of these other languages when we met.