I sure hope this isn't a true story.
The first thing that got you thinking was the glasses on the headboard.
My girl doesn't wear glasses. you thought....
And then you thought.. Why is she up?!?! Every time I come home from work at night... She's asleep.
But the thing that made it clear was that the fan was pointed at the bed. She notoriously hates being cold and having a fan on her so that can mean only one thing.....
Hot sweaty sex
Sorry you had to find out like this bro.
:)