Because an enema is an invasive, intimate, and (some say) humiliating procedure, it can serve as an effective method of physical and psychological punishment. However, it's important to remember that a punitive enema (PE) has several important differences from a regular enema (used for medical reasons).
1. Position.
Administer the PE not in the accepted medical positions (lying on the left side, knee-chest, etc.), but in a special position known as the OTK. Sit on a chair and make the subject lie on your lap with their bottom up and their legs spread wide apart. In this position, the subject will experience intense humiliation, as they will be in the most compromising position possible. They will experience a feeling of complete humiliation and submission, as their bottom will be higher than their head relative to the floor, completely exposed. Their spread legs will make visible to you (or other witnesses to the punishment) not only their bare buttocks and anus, but also their genitals (the vulva in women or the scrotum and penis in men). Furthermore, the subject may experience a feeling of age regression, as usually this position is used when giving enemas to children.
2. Equipment.
For a PE, use a bulb syringe, not an enema bag typically used for administering enemas to adult patients. When administering an enema using an enema bag, the nozzle is inserted and removed from the patient's bottom only once (before and after the procedure). A bulb syringe's nozzle, however, would have to be inserted and removed multiple times for refilling, which would prolong the procedure and cause the patient far more pain and humiliation. Furthermore, it's wise to use a bulb with the smallest possible bladder and the largest possible nozzle. Such a syringe would have to be inserted into the patient's anus many times, each time causing maximum suffering.
3. Substance administered.
When administering a PE, use special substances and mixtures that will have the most severe and painful effect on the subject's bottom. This could include ice-cold water (causes painful intestinal spasms), a concentrated soap solution (causes spasms and an unbearable burning sensation in the bottom), or a special solution consisting of water, glycerin, hydrogen peroxide, and dry soap shavings (causes extremely intense intestinal peristalsis, resulting in unbearable spasms and pain). It's worth noting that a concentrated soap solution also has a longer-lasting effect - if the intestines are not rinsed with clean water after such an enema, the subject will experience a burning sensation in the bottom for several hours after the procedure.
4. Lubricant.
When administering a PE, instead of skin-friendly substances (Vaseline, KY, baby cream, etc.), use irritating lubricants such as menthol gel or ginger oil (they cause a painful burning sensation in the bottom). Furthermore, don't limit yourself to simply lubricating the tip and the external surface of the anus - fully insert the lubricated finger into the subject's bottom and begin to repeatedly thrust (friction). This will allow the lubricant to be inserted deeply, better distribute the substance along the rectal walls, and provide additional humiliation for the subject, as this action may evoke sexual associations (such as a sensation of being anal raped).
5. Retention.
Once the PE is complete, do not immediately allow the subject to go to the bathroom to relieve themselves. Encourage them to retain the liquid in their bottom for as long as possible. Inserting a bitt plug or rectal dilator into the subject's bottom can be very effective (both from a practical standpoint and for the purpose of inflicting additional pain and humiliation). Furthermore, to apply psychological pressure, inform the subject of additional measures that will be taken if they are unable to retain the liquid for as long as required or if they leak - another enema, spanking, etc.
I once witnessed a young (31) chubby woman being punished with a PE. The procedure involved the OTK position, a 200 ml. bulb with a 6 cm. diameter butt plug-shaped nozzle, and a concentrated soap solution. The result exceeded all expectations: the bulb had to be inserted into her bottom 14 (!) times, which was extremely difficult for her. The woman was psychologically broken, crying and begging for the punishment to stop halfway through the procedure!