^ Same! m-flo as well, especially now LISA is back
I'd also love a collab with CKay, Thelma Aoyama, or Miliyah... And as I much as I love ayu and Kuu, I agree it'd be hard to match both of them in a song, but a rock-ish song might be a good try, more than a ballad imo
avex should do something similar to SM Station and having its artists to collab/cover each other on a frequent basis, there could be so many great stuff coming out of this. But then avex loves physical releases and those things are mainly for YouTube and Spotify, so I think that's unlikely to happen. A pity.
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Oh, and it just came to me... Where is Driving Hit's 9??