Vanilla (translate) Lyrics

Lyric discussion by Gothy_Bura 

Cover art for Vanilla (translate) lyrics by Gackt

What does he mean by "cring knees"?

"cring knees" I might just be a perv but i think he meens that his/her knees hert after being on them for so long giving someone oral? (blush) its GACKT so this might really be wut he ment