Sounds like its time to let him and her go so they can be together. Either that or start adding hot oral to your repertoire so that you can get some good long oral also. Why not ask for that.
If they are really together, maybe it is time. I had a shared lover with my husband for a time and it really became obvious that we needed our own time together and that he and I were hitting it off more. Its okay, it happens. It might be better in the long run to let it go and let her give him those blow jobs in private. Part of his lack of cumming might be due to you being there no?
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