The only thing I would like to add is keep the line of communication open. Even if it does seem like you are making suggestions I would have to ask what is wrong with that. He may be very grateful for your ideas and suggestions, I know I would. You don't need to choreograph all the moves, let him take control if he is interested. All you are doing is telling him what your fantasies are. If you can't tell him now you may never be able to or you may think you can't find the right time. That time may be now.

As was stated, he may not be as vanilla as you suspect so telling him your fantasies and desires is a great means of communicating. You'll know if he likes what he is hearing or not since you know him fairly well already.

If the shoe were on the other foot wouldn't you want him to confide in you? This saves looking for what you need and want elsewhere. Best of luck and you do have youth on your side.