Ah physical contact - my favorite part lol
I don't think I could offer advice since everybody's different and what your INFP prefers might not be the same as mine. But generally, I think you should act normal, be confident, be comfortable, be free to act according to what your mind tells you to.
INFPs love the spontaneity of INTJs which reveals their child-like angle (I remember sometimes - actually it is very rare - my INTJ would sit at the kitchen table and fold paper airplane or use rubber band to shoot some objects. That was some really awesome moments that I have the privilege to witness awwwwwwwww)
INFPs love the moment when INTJs went silent and lost in their thinking mode. The thoughtful facial expression, the day-dreaming eyes, ahhhhh, that's just so manly to me.
INFPs love it when INTJs try to adopt some social manners and act manly and politely just to please us awwwwwwwwwwww
INFPs love it when we know INTJs are interested in us physically but still treat us like 'sacred' human being and never have intention to go beyond the line except sometimes initiating some small physical intimate (standing really close, accidentally touching hands/laps)
INFPs love it when INTJs feel secure and comfortable enough around us that when talking with us, they look warmly and deeply into our eyes, their voices are soft and caring. At that time, it seems like we INFPs become little girls enjoying every beautiful little things in life while INTJs stand silently besides smilingly watching us and protecting us in case dangers come.
So, that's my opinion. Awwwww, your INFP is so lucky since you really cares about her. I wish my INTJ could care about me so much like that
