the expression "single instance" should be okay. The rhyme "sex" - "flex" might be a bit strained. JD suggested "let me taste you there" instead of "let me taste your sex" (actually I didn't mean it that literally, but never mind), so the third verse might read:
while we feel in line
let me taste you there
send shivers up my spine
send shivers everywhere
I've not decided yet, though. JD also finds "grant me the things I sought" too formal, and suggests phrasing it ".. the things I want" so as to make it more conversational. Well, I'm not so sure...
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