I think they did not go any further than what we saw.
After all the story is called "... SLOW Life".
If they reached that step already in chapter 12 then it would not be a "slow" life at all, right?
Considering how she acted when she entered, I was expecting a yobai visit. But that could've ended after that night, whereas how it seems to have turned out won't change their relation that much.
I don't mind the asexual MC, this isn't a romance and it's a SUPER lite story overall. That being said, just don't do the harem thing. There's no point. It's just a waste of time. Now I feel like an idiot for caring about a character that has absolutely no purpose, (except to show the MC isn't gay?), and will be discarded. Who knew this 'Marty Stu' power fantasy would have poor character development.