“As long as I keep you from having an orgasm, you'll agree to do anything I want?” The answer to that question when asked of a man on the edge of orgasm is invariably, “Yes.”
Don't believe me? Try it sometime! Of course, once he has had an orgasm his entire attitude will, most likely, change. That is, unless it is something he doesn't mind doing in the first place. For example, many men are willing to drink their own cum, so asking him to do that might not change with an orgasm. But what about sucking another man's cock? Not many will do that without the proper incentive. In fact, I have found that most women who actually want their partner (slave, subbie, boy toy, or what have you) to do something often ask this question in the wrong way or at the wrong time.
What do I mean by that? Here's an example of asking the wrong question (or asking in the wrong way); “Will you suck another man's cock if I let you cum?” Do you see how that puts his reward before he has completed his part of the bargain? Instead, try putting the question to him as a statement this way; “I will let you cum if you first suck another man's cock.” Or, “You can have an orgasm as soon as you have sucked another man's cock.” See the difference? If you really want your victim to perform something he would not ordinarily do (perhaps something humiliating) promise him a reward only after he has completed the task, not before.
I know that many woman have difficulty learning to talk erotically to their partners during sex. Because of this, they tend to be timid when it comes to psychological torment. You may never want your partner to suck another man's cock (just for example) but making him think that you will can be very sexually arousing to him. Obviously, if you are only attacking his psyche with your play, you would want to ask the question differently. Instead of making him perform the task before his reward, you simply want him to agree to complete that task. That is, you want him to say that he will suck another man's cock (or drink his own cum, or dress like a woman, or whatever the task is) before receiving his reward, especially if you don't plan on making him actually follow through.
Ladies, please understand the difference. Every man who enjoys being sexually teased (and they all do) has fantasies of things he would love to be “forced” to do. He also has a list of things that he likes to fantasize about being forced to do but would never really do under any circumstances. Your job, as his tormentor, is to learn what these things are and which are which. Then, and only then, can you really keep your partner on his toes and torment his mind, as well as his body, properly.
In answer to all the questions I've received on the subject... Yes you can make your guy agree to just about anything as long as you keep him from having that orgasm.