Hm, if the spell is cast you only need touch and eye contact in my book. Language is overrated in such a situation. But let's pretend it is even more serious than physical attraction, I am in both cases willing to learn more French. But I admit before I could reasonably well communicate in Chinese I would be sexually exhausted. In fact I did learn first the body language of my ex and her Russian afterwards. Or a little bit of her Ukrainian Russian. We often had to exchange in a mix. Her French was always better than mine, my Russian was abysmal despite my effort, her English was awful, but I taught her some German which she adopted quickly. She loved German. But what really crushed me any time was when she talked Russian. It is a very good language to utter sweet talk and "dirty" talk and Russian has a huge ability and range for that. There are a dozen prime ways to say "I love you" in it. Let alone all the subtle different ways of complimenting, Russian is very diverse and rich in that. I am generally bad learning languages. I totally lack talent and I only advance at a slow pace when constantly under pressure. But I balance it out with good kissing. My ex was actually very fond of my tongue, lol.