What To Do Before You Can Romance Petra
The first opportunity to romance Petra arises during The Huntress. To begin this quest, you’ll first need to build the Hunter’s Hut once you’ve reached Level 2 - Colony status in Ravensthorpe. Petra and her half-brother, Wallace, will be grateful that you’ve built the hut for them, and Petra will invite you to join her on a hunt. Despite the implication, you don’t need to go immediately at this point. You can return at any time to begin the quest when you’re ready.
After waiting a few days once you’ve completed The Huntress, you’ll be able to return to Petra at the Hunter’s Hut and speak with her to begin Have You Seen This Man?. This is a fairly long side quest during which Eivor will help Petra search for her half-brother Wallace, who has gone missing. At the end of the quest (or a few days after) Petra will ask Eivor to join her for an archery contest nearby. It doesn’t matter whether you win this or not, at the end of it Petra will tell Eivor about her feelings for them, and you’ll be able to respond by telling her that you feel the same way, or that you care for her only as a friend.
Assuming you choose the first option and begin a relationship with her, you’ll now be able to do all the usual things that you can with every other romance, which are limited to a kiss and going to bed together. However, with Petra, you’ll also be able to choose “Shall We Spend Some Time Together”? which involves the options to play Orlog together, engage in another archery contest, or have a drinking contest. You’ll also have the option to break up with Petra at any time, but you should know that she won’t speak with you again after this. There are no other long term consequences of beginning or ending a relationship with Petra.