OK, this involves a special aroma you've always liked, e.g. a lotion or a perfume. Whenever you're horny (and I mean TRULY horny) sparce the aroma in the place you want to jerk off and use the technique of your choice, preferably one you know will make you have a great orgasm. When you're about to reach it (like 5 seconds before), sparce some more fragrance or put some in your free hand and smell it so that it'll penetrate into your nose at the same time you cum.
The next time you jerk off using the aroma, it'll automatically trigger an effect that will remind you of how great the last orgasm was. It'll get you horny and (for sure) you'll have another great orgasm.