I'd like to imagine that this cute couple is a sibling. I mean they have the same hair color, the same eye color, same not very wavy hair, same atmosphere when they're together. If someone you doesn't like the idea of them being a sibling then you're free to ignore this but this is just what I think it is.
Also don't get me wrong I like them either being a sibling or not. I mean who would hate this much cuteness.