Someone asked for help getting her sub to eat his own cum. For anyone who hasn't tried this, it's actually harder than it sounds. For anyone who has tried but failed, it's much easier with the right approach. But before I get into the how, I want to give a small warning. The whole point of forcing someone to swallow their own cum is making them do something degrading and humiliating that they wouldn't normally do. One thing I find disappointing is learning that a sub, on his own, will eat his own cum. If someone already swallows their own cum after they orgasm, it takes the fun out of making them do it. Firstly, they aren't doing it for you. If they do it of their own accord, they are doing it for themselves. Secondly, the sub gets use to it. It's no longer humiliating or degrading for them. It becomes common and normal. Boring.
Sometimes the top will make a sub eat his own load every time. Like I said before, it desensitizes them to it. But some tops find it sexy to break someone. There is a sense of accomplishment and pride, not to mention power, in really changing someone. I can understand this angle, especially if the sub is the type of person who gags at even a taste of their own man seed; an attitude adjustment is in order. I've also heard it argued as a way to save time cleaning up. In the case of sucking someone else off, I agree, it is cleaner. But I'm calling shenanigans in the case of a sub licking up his own load. This is some guy's justification for a fantasy he can't otherwise rationalize. A tongue is far from sanitary; more cleaning is still necessary. The only way it saves time in cleanup is if he's swallowing his load, with his mouth directly on his cock. Now, while not an option for most men, I'll admit this is appealing to me, especially since time saved on clean up is more time for something else. Also, consider the frequency you make your sub eat his own semen, as you might unintentionally numb him to the act. Personally, I like to save it as a "treat."
There are many approaches to getting your pet to eat his own cum. Some will work better than others depending on your sub. You can go with whatever you think will work best with your sub, or whatever sounds like the most fun to you. Of course I'm not recommending you break any of your sub's limits (unless you know he'll be ok with it), but forcing a sub to fulfill his fantasy is both fun and sexy. If you are doubting yourself and want more justification, then see the second half of my post on following through.
The most common approach is by command. Make the sub come on his or your hand, or if you're feeling generous, your breasts, legs, feet, or whatever. Then order him to lick it clean. This is the first thing that comes to mind for most tops, but is also the hardest to make someone follow through with. This approach can work, but only if you are very strict. Think of the voice you use when telling your dog to stop poking at the trash can, or when you're telling your cat to get off the dinner table. Speak sternly, imply urgency, and raise your voice. Since this is one of the hardest approaches, it can also take several tries. If you notice your toy hesitating or otherwise struggling with the command, I suggest giving him an out. Tell him what his punishment will be if he doesn't obey. Pick a punishment he won't like, and up that punishment with each attempt. For example, if your sub isn't usually denied orgasms for a week then tell them if they don't follow through you will deny them orgasm for a week. If they choose this option then try again in a week, but next time threaten two weeks punishment. While I imagine this will eventually work with anyone, it might be hard to find the right punishment. Don't start out with the worst punishment you can imagine though, build up to larger and more serious punishments. Someone refusing to eat their own cum at the cost of no orgasms for a year, might actually be willing to do so at the threat of not coming for a month after suffering through two weeks of no orgasms. If this is the approach you want to use, but it's not working, try not to get frustrated. Some subs just have a hard time with this. Instead, think of it as a game to see how much your sub will suffer through before giving in.
This second approach requires a little more preparation. This is generally the approach that comes to a sub's mind when they fantasize about being forced to swallow their own load. The key to this approach is lack of options on your sub's behalf. Put him in a position where he can't say no. My favorite way to do this is the legs over the head trick. Have him lay on his back and lift his legs back over his head until his cock lines right up with his mouth. What helps is having him lay such that when his feet go over his head they land on a wall behind him, then have him walk down the wall to narrow the gap between his mouth and cock. You may have to move your man around a bit and start over to get him lined up properly. When he's lined up make him come into his own mouth. This might actually take a couple tries before you get a good amount in there. Hold him in that awkward position by the balls, make sure you have a good grip so he knows he can't just lay back down. Another option is to position yourself behind him so he can't unfold. Tell him he has to swallow it, if he hesitates hold his nose with a free hand. He'll have to swallow to breath. This is more commonly accomplished (and fantasized about) with bondage. Make sure he's secure and can't move, then make him come into a shot glass. A small cup like a shot glass is essential, or too much of it will get stuck on the sides. Tell him to drink it, again if he refuses hold his nose and pour it into his mouth. Let him breath but repeat the process to get him to swallow if necessary. There are alternatives to holding his nose if you think that might make him panic or choke, or if it just isn't your style. One alternative is a little abuse to the balls. Even people who enjoy CBT will find it hard to take a couple hard swats to the balls after orgasm. Another is, if you have e-stim toys, use them to make him come, but after orgasm keep turning up the power until he obeys. There are a lot of options really, any sort of pain should do the trick. When using pain I always suggest it be something erotic in nature to make thinking about it afterwards a more positive experience for the sub.
This third approach is down right insidious and underhanded. I think it's great. The tricky part in getting a man to swallow his own cum isn't getting him to admit he wants it, or talking him into it -- that's easy, just get him horny enough. The tricky part is getting him to follow through once there is a load for him to swallow. If only you could get his load into his mouth before he comes. Well, you can. All you'll need is an ice cube tray. If you already make your own ice then get one that looks different than the others. When your sub comes, make him come into one of the ice cube slots. Although one load is probably enough, I suggest getting two to four loads in one slot to make a larger cube. When you decide it's time for your man to eat his own load, get him good and horny, maybe even bring him to the edge a couple times, then break out the ice cube. You'll easily be able to get him to suck on the cube when he's all worked up. And like that, he's happily swallowing his own semen. Make him finish the whole cube before being allowed to come. It's too easy. If you want him to have the real experience, if you want to do something he would fantasize about were he clever enough, start by tying him down. Tease him until he is willing to suck on the cum cube. After he takes the cube into his mouth, make sure he can't spit it out. Gag him with a ball gag or wrap bondage tape around his face and mouth. Do not untie him or ungag him until you're sure he's swallowed everything, but do not draw things out. Make him come immediately, before he can consume much, if any, of the cube. Make him watch as you catch his load with the ice cube tray to help him realize exactly what he's about to do... swallow his own load after coming.