A threesome? /jk
Or... there is a book I think called "101 Nights of Great Sex" or something like that. Each page in the book is a sealed envelope. Half are meant for him, half for her, and one finale envelope for both. Each week, or however often you choose, each person tears out an envelope, and follows the instructions inside. Most of the envelopes have instructions to carry out throughout the week, leaving little clues around the house for the partner to find, increasing the anticipation of what might be in store. Perhaps, you could get the book, and lead things up to actual Valentine's Day. We got the book as a gag gift for an anniversary, but it turned out to provide a lot of, um, fun.
