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You have to get the throuple ending first. Persist after getting the throuple ending and you have to get both of them to accept a three-way sex. In order to do that, you need to have sex with the other person while the other one is awake and in the house, making them jealous. Once you've made them jealous you have the option to make it up to them by make up fuck/blowjob or choosing not to entertain them.

You have to do the Family Union storyline. During the first stretch of the story (first 5 acceptance point), you'll have sex with either the step dad or step bro and get caught by the other. During the explanation, you have to make up for either of them by either a bj or fuck unlocking the scenes.