I love this song and does fit them a lot. I don't know if you taking request but I found the perfect song for CaptainSwan. It called Best Thing by Anthem Lights.
OMG!! I love that song! I'm not taking requests at the moment but I do have that song on my list of songs I need to do for CS so you will get it. I don't know when I will do it though. I'm working on another video at the moment. Here's a hint it's not CS and the song is from fifty shades.