Chinese guy chats up two Iranian sisters, no

This requires several steps, and the time of each step cannot be fixed, it depends on people and circumstances -

The first step is to understand first, and then no matter what The reason is that you feel the need to keep in touch;

The second step is to find topics or things that both parties agree on. This is very important, otherwise there is no basis for cultivating feelings, and you will have unrequited love!

The third step is to strengthen, understand, solve, and continue the topics or things that you both agree on. This is cultivating the emotional foundation. Whether you can sublimate this feeling is the third step! It's up to you whether you want to continue to ascend.

But whether we can meet your requirements in the end depends on some fate and luck!