Just like KO summed it up, you talk to the church girl "ask about herself", you go to the outpost and buy codpiece, bring it back to her to find it's too small, go the witch and she mentions vampires, go to the mossy map where the outpost is to encounter vampires (described "pale women" on map ) , go back to church, "ask about herself" again and vampire sisters will appear to have a little fun. Fun event though no art at this point, we will probably get more as fight with both sisters is still described as "not finished".