Confessions are the lowest form of relationship statement.
Throughout the series it's made plainly obviously that it's all Tsukune x Moka. There is ALWAYS that element of Kurumu/Mizore/etc.. that have extreme interest in him, but it's almost barely considered besides the fact that their feelings are meant to be real, just one sided in the love aspect.
Kurumu = finally has friends and thus happiness, due to Tsukune.
Mizore is similar though more anti-social.
Think of it as a love of respect, where Moka and Tsukune seem to have a deeper relationship (because the plot is designed for it, obviously).
Besides all this, I think they have actually said "I love you" to each other or whatever, but it's barely needed.
Sex will probably never happen, but hey, you never know.