Even if Brother Yan is being considerate towards the Professor and Madam's dignity, or pitying her for growing up without a father, he should still be mindful of his boundaries and maintain some distance.
Do they not realize that girls of this age are the most likely to overthink things?
Does he not know that his attitude can very easily give the wrong impression?
Xu Jiayan's hand tightened around the girl's waist and he said, "Yueyue had a falling out with her mother for a while, and it was pretty severe. The girl was just in her rebellious phase; she ran away from home and it took a long time to find her. At that time, I had just started assisting the Professor with experiments, and I helped search for her."
Actually, it was he who found Qin Yue first. Seeing her reminded him of another girl back home, which made him more patient with her than he would have been with someone else.