It strikes me that the moment that the woman lapsed into unconsciousness, consent ends.  In that case, the details of prior events do not greatly matter.  The Department of Justice guidance on consent states that "consent is not obtained, where the complainant, having consented to engage in sexual activity, expresses, by words or conduct, a lack of agreement to continue to engage in the activity."  Lapsing into unconsciousness would strike me as 'conduct expressing a lack of agreement to continue to engage'.   But that's just me.