This app was mentioned in 4 comments, with an average of 1.75 upvotes
First of all, it is great that you put so much thought into making your partner feel good! :)
Now to your problem: A large part of sexuality is not physical but rather psychological. So how about you ask him if he has some sexual fantasies that the two of you could try out together? (e.g. bondage, roleplaying etc.)
If you are too shy or you think he might be too shy, try a tool like this: https://play.google.com/store/apps/details?id=com.undercovers.android Disclaimer: My boyfriend developed the app, so I am biased of course! Still I think it is pretty great! :)
The same idea exists as app. It is a bit more comfortable and looks better than mojoupgrade but you will need to by an IAP for like 2-3$ to fully use the app.
iOS: https://itunes.apple.com/app/id866000925
Android: https://play.google.com/store/apps/details?id=com.undercovers.android (Android only available in Germany at the moment :/)
Disclaimer: I am the developer :)
https://play.google.com/store/apps/details?id=com.undercovers.android
(New to reddit, hope this link works)
UnderCovers - Let's you find out which sexual fantasies you and your partner have in common.