I think the default "good" ending with the Protag and priestess will, in the long run, be unhappy for both of them. He's clearly just kind of going along with whatever the priestess says, because his only experience with romance resulted in trauma for him. It's pretty clear he wants to think he loves Priestess, but he doesn't. Meanwhile the priestess is a size queen who is in love with love, but in denial about what she actually wants. Both of them will realize this at some point, and it's better for them to realize it now.I think at this point, Protag + PM even has more scenes than Protag + Priest. Oh well, this isn't a pure love story anyway