An interesting intrep. Not sure if I agree:

Oh you're in my blood like holy wine

You taste so bitter and so sweet

Oh I could drink a case of you darling

And I would still be on my feet

Oh I would still be on my feet

I can see the weakness thing as a legit reading. And yet...there is something about telling someone that they are in your "blood like holy wine" that seems like something you don't say to someone you consider to be weak. So... I think either interpretation is reasonable.