I cannot stress enough the significance of these two sets/settings.
Stefan and Elena are standing pretty far apart. Their surrounding is nice and organized and clean. The environment around them is simple and it’s safe. But on the left you can see a shimmering light, a hint of a flickering flame against the wall, dim and dull. Like there was once a fire there, but now it’s small and disappearing. Not completely gone. Like a memory.
Then we go to Damon and Elena, and everything’s different. The room is red and warm and cozy. The room itself has come to life. They are passionately kissing by a roaring fire, representing their love, as well as the fact that these two characters are quite frankly two twin flames. Twin flames that have now come together to ignite an all-consuming fire, like the one right behind them. Just like Damon said to her the first time they met: “You want a love that consumes you. You want passion. And adventure. And even a little danger.” Just like the burning fire behind them. Just like this moment. Just like their love.