Oz's Idea is great

How about this idea, You mentioned that the vibrator and stories are getting old... why not try this.. Print 4 of your favorites out.. Highlight and underline the parts that really excite you. Once you have everything printed underlined and highlighted, Wrap them in a ribbon or tissue paper, and present them to him along with a a note, stating simply, read and pay attention to the key parts... and that you want a bit of what he finds a turn on within the pages, in say 6 days time?

We all love spontinatity, but some scenes require advance planning.. Tell him he has this time to "make it happen" add the Please Master to the end of the note and see if that helps