Obviously, tease and denial (T&D) is fun for the recipient. No matter how many times you do it, he (or she, for that matter) will always want more. But if it is not fun for the teaser, or if it becomes monotonous, the teaser (you) will eventually stop doing it. You may even resent doing it.
I have always said, “Imagination is the key to sexual pleasure.” If you don't have the imagination you need to keep things fresh for the both of you, you will begin to look at it as a chore instead of an enjoyable activity.
You don't have to have a great imagination. There are millions of people around the world with great imaginations. All you need to do is to tap into them (via their writings) to find something that you have never done, that you will both enjoy.
Are you tired of simply stroking his cock while he is bound to the bed until he begs you to let him ejaculate? Then do something different. Try something you read about on the Internet. Try the things that will make it more fun for YOU.
Okay. You may not need to actually do it. Maybe you can simply tell him about it. Like the photo above. Try telling him that you would love to invite your best friends over and let them all tease him. The stories you tell him can be all you need to see what I am talking about.
I promise, the more fun you have, the more fun your partner will have.