That's a great Q.. everyone asleep

I am in camp "MM primary target" , largely down to an early comment from SG..he didn't need to have gone upstairs, IMO, what he went to the house for was upstairs on the top floor. KG wasn't meant to be there that night as she'd moved out and was only there on a flying visit.
I wonder if, (had KG been in her old bedroom with Murphy and MM been alone in her own bedroom, he might have had a sexual motive.
He didn't seem to have had much success with "romance" in his past so had he morbidly fantasied about MM while watching her through her window? What he'd like to do with/to her if he could just get her alone?
Finding her asleep/passed out drunk would he have used an implement to SA before killing her? The fact that he's suited up means he definitely intended to harm her and leave no trace.
I wonder if he would have spent much more time in that room with her alone doing unimaginably awful things to her if he wasn't disturbed
Done what he set out to do, killed her (maybe not, maybe just horrifically abused her and left for dead), crept back out down the stairs and through the sliding door and away without leaving a trace.
IMO JMO MOO of course