ISTJ certainly opens up well with alcohol. Works every time. The most important thing is that you establish rituals. Say hello and goodbye in a strange voice or something (srsly) every single day, or say the exact same thing every time you do a certain thing. Have the exact same conversation every time a certain topic comes up. Ritual, routine, predictability -- you can make it up out of nothing, as long as you are consistent. Remember some little quip they made and apply it at every possible opportunity until it becomes a catch phrase between the two of you - they love that shit. Schtick, y'know? Code words. Inside jokes. Watch for them waiting for you to do the same thing tomorrow that you did today. For example, I once advised mine to borrow my umbrella because it was raining out. The next day, as she passed by my desk on her way to lunch, she asked if she should put on her coat or something. Caught me completely by surprise and I was thinking, like, what am I, the weather man? so I said something intelligent like, "Huh?" and she looked puzzled. We had constant disconnects like that until I realized she wants the same thing every time, every day.