Honestly, I feel like this is the perfect ending to the series. The last few chapters already went in depth to their relationship and how much they mean to one another, and so a clam, slow chapter that takes it's time and pretty much implies "more of the same" after this with the direct implication that they will get together after this is perfect for how this series has gone so far. It fits into the ongoing theme of MC wanting a down-to-earth life and instead of trying to do fantastically or overly dramatic things in his dreams, and such a simple ending seems like it's the best. I don't like series that go on indefinitely, and I think here may be just a good place to end it as the main arc has concluded with MC being much better mentally than he was at the start.
Also, just noticed but the tails of the Succubi show their sexual preference.