That is a very interesting twist on the "kissing your sleeping crush" trope. To sleep through such an intense make-out session and learn of it in such an odd way is just too humorous.
I confess at first this story has not been able to hold my attention very well, but Tongtong's genuine and clumsy attempts to learn how to love another girl are very endearing. Though Lu seemed a bit more jaded and guarded, she is also just a fledgling lesbian trying to make it in a society that is not accepting of such things.
I hope that Lu's mother will not become an obstacle as the story seems to foreshadow so much. Tongtong's mother on the other hand is a breath of fresh air, even if she is completely blind to the workings of same sex relationships.