Board Thread:Speculation House/@comment-3257939-20150601205621/@comment-209421-20150606052129

70.160.219.131 wrote: I really like Sun and Blake. I feel like there is a general give and take. Blake is very idealistic, with a strong moral compass, which is a huge part of her character, and I feel like Sun is much more realistic, with a kind of anti-nihilism that Blake really needs in her life and probably appreciates. Which is probably the reason she gets along with Yang so well.

Finally, somebody else who sees reason! I've been saying that exact same thing - of all the relationships that have or could happen in the series, Sun and Blake's feels the most natural, and there's enough shared personality between Sun and Yang for Bumblebee to work.