Older & Bolder 5 - Older & Bolder, #5

Older & Bolder is a series of erotic short stories about older women who know what they want and aren't afraid to ask for it. Silvia and Mark are invited to a party by their younger neighbours, Kevin and Rona, but what they imagined was going to be just a few drinks, appears to be a swingers' get-together. They wonder why they were invited and discover its because the youngsters are eager to add a more mature couple to their group.
They've been faithful to each other for a long time but now, in their 50s, are they ready to spice up their sex lives?