It was some moves on bed . LWJ wasn't planning on doing at first because his Uncle was around there, then WWX's interest suddenly shoot up. He didn't help WWX actually took the bath, but he prepared everything and put them around his bath barrel. WWX invited him in, but he refused saying they already broke too many of bathtubs lol.
Not sure what happened in the revised version. Based on the version I read, in the end, MC asked him about it in front of everyone, and he pretended he didn't know anything. And the rest was left to the reader to judge.
Gotta share my favorite two videos: They are in chinese so maybe hard to understand but these two videos are legit! *sobbing*
I like this one a lot, but it hasn't been uploaded to youtube yet... https://www.bilibili.com/video/av5542485/