I entered nothing
(I didn’t have butt sex with anyone)
And nothing entered me
(No one had butt sex with me)
Until you came with the key
(His penis came in Morrissey’s butt)
And you did your best but
(Morrissey thinks his butt was the best butt)
As I live in breathe you have killed
(I have AIDS now)
Yes, I walk around somehow but you have killed me
(I have AIDS and I’m dying slowly because of butt sex)
Possibly, but possibly not 'in' Moz...isn't he just the narrator, like in so many songs, as opposed to the subject? Although he does seem to flip from narrator to subject in songs, so you never really know for sure.
As ever, all ambiguous & therefore theories abound, depending on the reader's life position & ways of thinking which influence their interpretation.