She's often spoken about the fantasy of me with other woman and described in much detail some her scenarios she has masturbated to, when we watch porn together she often asks if I want a turn on the woman in the video.

Just recently I text her asking what I should wank to that night as she was away with friends and she text back saying 'i want you to imagine you've invited a load of young sluts over to fuck whilst I'm away on a business trip'.

This is a recurring thing and you get the idea, but I'm interested in getting the ball rolling as I love being naughty with my girlfriend and I've always had a seriously high libido, so having two woman at the same time would be a huge thrill.

Anyone have any experience and know steps I could take? I showed my girlfriend a video of me fucking another woman from before we dated and she loved it.

What would an appropriate first step be to suggest?