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He is very good natured with very well trained.
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If this dog was very well trained (which I doubt he is) instead of watching him mount your female you could put him in a down which is completely incompatible with mounting. If I were sitting such a well trained dog that is what I would do unless I was otherwise actively engaged in doing something with the dog (fetch, walk, etc.). And/or every time the dog tried to mount my dog I would tell him OFF.
Since he probably wouldn't obey an hour long down I suggest you keep them separated, use a crate if you have too or call the owner to come get their dog.