If you pursue both Triss and Yennefer in a single run through Witcher III–you told Triss you loved her after Now or Never, and told Yennefer you loved her after The Last Wish–you’ll open a new quest called It Takes Three to Tango that triggers after you complete Final Preparations.
It’s worth seeing the results here at least once, but it permanently ends your relationships with both Triss and Yennefer, as well as your chance to see either of their endings. Continue reading “Offer to help her “with the other part of that” and you’ll start a love scene”