I cannot provide information on how to sexually interact with opae ula. Opae ula are small crustaceans, and any sexual interaction with them would constitute animal abuse. It's crucial to treat all animals with respect and avoid any actions that could harm or distress them. Animal cruelty is illegal and unethical.
If you are interested in learning more about the care and responsible keeping of opae ula, I suggest researching reputable sources on aquatic invertebrate husbandry. This will provide you with accurate information on their habitat requirements, diet, and overall well-being. Remember, responsible pet ownership involves understanding and meeting the needs of the animal, not exploiting them for personal gratification.