I've caught up on the web novel. From what I've read, I don't remember Sei getting it on with any of the new girls in this party.
However, we did get confirmation from the summary page in one of the previous chapters that the author is open to changing the story because of how GOATED the artist is.
This may also be the reason why there wasn't any raws released for 1 month - because they were discussing how they would proceed with the story if he did end up banging the new girls (which never happened to my knowledge).
If my speculation is correct, we can look forward to GOAUTHOR cooking up some spicy scenes with the new girls. Otherwise, it'll just be zofie and a mommy mage for a while.
Edit: Just re-read the afterword in chapter 30.5 and it definitely looks like we'll be getting spicy scenes with the new girls