I wrote this in another tread. Maybe it's to dark or something but I have seen this kind of stuff before.
I love this idea of the Darkroom pure taboo style for this.
This could work for both BGG or BGGG.
The scene is that you are kind of a cult leader or just a guy that is in a multipartner relationship with multiple girls. Everybody that is in this relationship is there for you. The girls don't necessarily like each other but they always listen to you.
To try to keep things peaceful in the house you spit up the time that each girl gets with you. All the girls know that you need to cum multiple times a day. Before work, after work, and before bed. With 2 or 3 girls they can take turns helping you with this.
I would start the scene at the kitchen table before work. Girl 1 is making you breakfast as girl 2 is making sure you are satisfied for the morning start. Girl one could be asking you about what you want on your eggs and so on as girl 2 is blowing you. This is not unusual for the girls because this is how every morning starts. You don't blow your load so girl 1 needs to trade off to try to help. This means that girl 2 now needs to get your clothes ready so you have something to wear for work. The girls can trade off not like normal porn where everybody is super happy but more like this can't take forever because you have to leave in an hour. But it's their job to make you happy. The blow job is not going to work for girl 1 so it's on to sex. They can go back and forth and the girl that is not having sex is cleaning around the house. You can see her walking around picking up things or washing the dishes. Obviously towards the end it is going to take both or 3 girls at the same time to get the job done. This is making me horny just thinking about it.
Alternatively you could start the scene in the bedroom with one girl sleeping next to you as the other girl wakes you up to start the morning. The girl that wakes you can start getting your clothes or she can start getting ready for the day as the other girl starts to blow you to start the morning. Then back and forth until both are needed.
Almost all 3somes are the same when it comes to the girls paying all their attention on you. I understand why they do this but just watching another girl going about her morning routine while having sex would be amazing to watch. Especially because she is just waiting her turn. With 3 girls this would be even more wild.
Maybe this is only my fantasy but I'd love to see this done well by the master himself.