The Rake — Vanessa Devereaux

Lord William Langtry hasn't been away to pleasure his wife since a strange fever left him impotent. With his brother about to be wed, William knows his wife Gillian must bear an heir. Choosing the right man to do the job isn't hard. In fact, he's thought of three. One by one they will pleasure her with the third being his cousin, Clive who has a reputation of being a rake and knows how to satisfy any woman's needs.