
if it was just voyeurism it wouldn't matter, the DIKs know that MC is alone that night, who would they expect to catch him with?
then we see a shadow pass in front of the lights, don't go near the window and he sees worse from outside than we see him from inside
to me it seems much more significant that there is a DIk who for some reason goes out secretly (for evidently personal business) in the middle of the night, not that there is someone who at every opportunity goes to spy on Mc hoping to catch him with someone, when with Bella it is optional, and that night there is clearly no one and the DIKS know this