@Demon
Spoiler!
Out of 2400 chapter of the novel I read 2050 so far and the red headed teacher was allways in live with yunxiao but not really the other way around. (Thats at least how I interpreterd it) But she has a devine body and he has one and they are compatible. Around chapter 1900 yunxiao is allmost dead but she is there and I think to save him they had intercourse. So maybe he took responsability?