It can be dicey to hit them with a surprise that is someone they don't know.
I did this once for my sweetie but made sure that the surprise gal was someone that I knew they really adored. She was ecstatic to see her as she lives in another city and they very rarely get to meet.
One of my ATF was having a birthday and we planned a little novel asexual activity and to then retire to my place for some playtime. Devious clod that I am, I planned to surprise her by having a mutual friend show up with a big red ribbon as a special birthday gift to the birthday girl.All went well except for the surprise part. The surpriser came down ill and couldn't make it. The birthday girl and I had the happy ending and I'm already planning for my upcumming 83rd birthday.
... by having one of her favorite bi playmates show up unannounced at her incall during a scheduled date with me. It made for a great birthday party!
The surprise lady was a good friend of the birthday girl and we had done a threesome before and are planning more in the future. But you are very right that if they didn't know and approve it could have been a real mess.
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