Blood and Wine Syanna Love SceneWhile doing the Beyond Hill and Dale quest, you’ll have to defeat a Cloud Giant boss. It’s a tough fight, but Syanna will help you out. Keep moving to stop him from ambushing you from below the clouds. Lead him towards the electrified pillars – when he hits them, the electricity will stun him, leaving him open to attacks.
Once the fight is over, you’ll have a chat with Syanna. When she says you’re still useful to her, ask her how. She will then admit that she wants you (in a carnal way), at which point you can either turn her down or let her have her way with you.
If you accept, you’ll get to watch the scene above, where the two of them make love while floating through the clouds. Thankfully, this short-lived fling won’t affect your relationship with Triss or Yennefer in any way.