Probably a fake brothel, get adventurers in, lower their guard, kill them and take their stuff.
The smile she have at the end is suspicious but MC face makes me think he got it figured out too.
Now if the "lower the guy guard" is just some petting or fucking to tire him out is something for the next chapter.
Pretty werid the saint is thinking of going straight to sell her body...can't she use her skill to heal in the city? Seems like the author simply wanted to make her say that, MC theory about she being traumatized and wanting to retire makes sense though, but still, going straight for that job...with her connections it feels very forced,
And MC...giving away your money and then thinking of how you can't afford to die because you got multiple girls pregnant...is one or the other.