Looking for scenes where extras ended up unofficially joining the action

There is a very good thread on freeones about this ( freeones.com/forums/threads/scenes-where-a-girl-an-extra-mistress-etc-unexpectedly-joins-in-the-sex.477987/ ) The idea is when someone who was not supposed to participate in the action ends up joining in, especially if it's an extra or a horny random amateur.

The best example I have until now is from the movie Titus Pool Party (2011) ( https://www.eporner.com/video-KQXuEwrNbtw/pool-party-with-titus-steel-and-jasmine-rouge/ or where two extras who apparently were there just to watch get intimate with the actors very sneakily. We can see them in the background sometimes throughout the video, but 99% they are either just watching or suspiciously close to some actor. The EPORNER video has the following (just some) interesting moments:

37:58 (approaching the actors)
43:36 (better view of them)
56:04 (you can see one of them suspiciously close to an actor)
1:11:45 (both get really intimate with the actors until 1:14:14)
1:28:13 (the other girl appearing in a suspicious bts with an actor)
1:30:47 (both get REALLY intimate with the actors but we don't see it)

If you guys could find more videos like this that would be awesome!

OBS: if there is an actual BTS showing what happened with those girls after the scene that would be perfect as well...

EDIT: The girl in the left is called Brigitte Fox and has already some hardcore