I have the same issue (its not a complaint). Once I have shot my load, I will stay hard for at least 5 odd mins, if no further action down their it will subside, but if the WG whats another session, then off you go. Alas, now days even though hard don't usually come the 2nd time in the hour (thats why I like to make the first one last the hour)
But I have had comments from my GF about still being hard afterwards, and she says its strange. Ideally would tell her not to talk with her mouth full -but she doesn't like giving oral