We know he'll refuse, but the walls are closing in on him. I wonder which girl will get him to give up monogamy
Well, in novel he helped her to bypass her technique bottleneck, but never did her, cuz never believed her to be chaste.
As for harem, if I remember correctly second was pinkhead(Bai Ran), then mortal milf(from mu manor. for a long time they hadn't go past bj and hj so doesn't count), after goes sect master Ning(squeeze him dry), then redhead disciple(insane yandere) and last for now(and ever, cuz novel basically dumped midway by now) is whitehead disciple(they double cultivate, but he rejecting having formal relationship with all disciples at once). And he promised Qi'er after stepping into immortal realm, but in current novel she's still little short.
Well, his clone did a mortal girl too.