Edit:
Let me rephrase that. Tsunku is running out of creative juices musically, but not lyrically. He might be a little too creative lyrically. And I think it's all that time he spent with his wife.
I'll let Estrea explain why.
Having Aichan sing a line about how alluring her butt is...that's ebil. Genius, but ebil all the same. XDDD
Actually, the whole chorus sounds way too perverted to be Momusu, but all the better for us? I'm kind of looking forward to seeing the PV now!
Oh and as for the chorus in question, I made a rough translation with help from Sevii's chinese translation of it. Some parts might be a little off, but the butt thing is for real.
Chorus:
Like a butterfly fluttering its wings beautifully, that alluring butt Sexy Princess
Isn't it good? That captivating smile
Like the beautifully shining stars, that alluring chest Sexy Princess
Isn't it good? Those captivating tears
Aren't those restless fingers great? Teasing just the way you like it
Isn't it great how it seems so aggressive? Kimagure Princess
Ohhh Tsunku...what have you been doing???