Is this even a thing?

So my husband and I have been together for a long time. We recently started talking about possibly having a threesome but I guess not really one??? I am bisexual and my husband knows this and wants to support it. He has shared with me he is afraid a girl would please me more but he does want to see me with one. He doesnt have any desire to be with the other girl but just watch me be with one and I occasionally suck his dick as I am having sex. He was very vanilla but has opened up more sexually but he doesnt want to do anything with the other girl just me. He also loves getting head until he cums and likes me cumming in front of him. Would we be able to find a girl down for that or is it only in our dreams?