The erossu goes to another household as his body has to build up more water resistance
Xia Feng was harsher on the luxurious ladies, but it had surely made them better as a women, that is. They were treating him not as someone who had a luxurious weapon, but as a man who was the true man.
Of course, Xia Feng had to put less time for them as he learnt about Wodu Vara's plan. This plan was not really a threating one solely because Wodu Vara was just worried about Xia Feng's potential.
It's a common thing for the strongest descendants to protect their status. Even if it means to lower the overall strength of their household! Once basked in a respectful eyes of the disciples was enough to turn Wodu Vara into a fox that is willing to use everything for his status.
The erossu could only go for his wives, but it was a slightly too hard for his current self. He had once met one of Wodu Vara's wives and he found her strength to be strong enough to reflect that erossu vibes.
Furthermore, everyone was truly in a love, so there was that.