Miss Alford also writes of the president asking her to 'take care' of his friend, staff member Dave Powers, who 'looked a little tense' in his description while they were swimming in the White House pool. Published: Miss Alford's new book, Once Upon a Secret: My Affair with President John F. Kennedy and Its Aftermath, provides a never-before told story of life in the White House with the president as his mistress Published: Miss Alford's new book, Once Upon a Secret: My Affair with President John F. Kennedy and Its Aftermath, provides a never-before told story of life in the White House with the president as his mistress 'It was a dare, but I knew exactly what he meant. This was a challenge to give Dave Powers oral sex. I don’t think the president thought I’d do it, but I’m ashamed to say that I did... The president silently watched,' she wrote.