By now, just by looking at the pools, it's clear that Tenka is best girl (she pretty much won by a landslide). But my guess is that the author is going to cuckblock us and still pair MC with his master. I like their relationship, but only as companions, not as lover. My guess is that probs the author didn't intent for Tenka to become a serious love rival but due to fan reception, and that is why we got that whole what if scenario, that is huge red flag that this is some fanservice and that is as we gonna get to that kind of development. I hope im wrong thou.