I am silent since a longer time, but still read the forums from time to to time and would like throw in my 5 cents opinion.
Wishing to share a slave is, imo, quite natural for a master. As a master I did it very often and with great satisfaction of all partecipants. I like to have guests entertained by my slave after an interesting SM session....
Of course this friends have to be choosen with care in order to minimize social and health risks. So I agree with all the other opinions given here with regards to your perplexities about fulfilling your master's desires.
I would like to point out another aspect that I found strange: your master wants you to become active and "hook up" a stranger or a workmate and then tell everything to him. Well, personally I read more a masochistic inclination than a master's attitude in this desire. He actually wants you to be bitchy and unfaithful and than to tell the details to him ....
When I got to know my long time slave carolin, she and her husband were swingers. Very soon she started to have a lot of confidence with me and told me a lot of details about her sexual life. She was definitely a sub and had made that clear to him ... so he tried to be a master, but his greatest desire and fantasy was exactly the same your master expressed: he wanted her to hook up joung men and have sex with them and then tell him all the details.
She deeply disliked the idea: she is fundamentally a shy, sweet and submissive person and so never accepted to do it, though she liked very much the idea of being asked to sexually service strangers, if these were choosen by her master, what she did a number of times for me.
Actually she found out quite soon that her husband was actually more interested in the submissive side of BDSM than the in the dominant role, what convinced her even more to carry on a long and profound story with me.
From my side, I liked very much the possibility of renting her, presenting her to friends she had to obey and service and I carefully planned and carried out a lot of situations involving her humiliation with strangers of both genders, but it never passed thru my mind to push her into hooking up somebody of her choice in my absence .... I would have considered it a betrayal.
Of course all the situations quoted above were planned with care in order to be safe and secure, she trusted me and left the whole responsability to decide what she had to do or to endure, as well as how, where and with whom, entirely on my shoulders.
Now that our story has come to an end I am very proud of the fact that, in spite of quite hard situations she experienced, she never had any problem, neither from the health side, nor from the social side and now she is living her life as a respectable wife and mother.
In the attached pic, carolin serving three guests.
regards
Kurt