So... I was rereading from ch1. I haven't seen this commented yet, but it does appear that the MC and Ru were going at it since the initial meeting, which is confirmed in C25 p2. The vagueness early on made it easy to overlook but there now appears to be evidence. See c9 p9 regarding the healthy body comment, and what I'm thinking is Ru's words in the last panel. Then again in C10 p2 second panel. Then including the angel in C11 p9.
It then seems that C12p9 where we were talking about the harem overpowering the mc was actually their revenge.
Still not sure why they started calling him Honeybuns when it doesn't look like there was consent. One of the powers perhaps. Notice the comments in c10 p 2 about what she was initially calling him.