I think you need to be with Lily, then invite Jill 20 or 21pm (might need to do this several times - dont finish at once, switch between both Lily and Jill), single bed might be required.someone said that once you have a threesome with both sisters enough mom will walk in and join. I did that a hundred times and she never walked in on us. Is there a specific set up for that? like who sleeps with who or a particular hour?