Ayu + Hikki = ???

[baka-ranger]

I think it would be fun, to collaborate once like with Ayu X KEIKO, I loved that duo. Though I really don't think Ayu and Hikki's voices would match, they're both great singers but they have completely different styles, in which I think wouldn't mix too well.
Also I don't think Ayu would be so desperate as to run to Hikki if she lost popularity among the fans. And as others said she's a perfectionist and wouldn't want others to get in her way all the time. And even if Ayu became desperate I think she'd rather go to Madonna haha jsut for the fun of it