I'm not really sure what I think of as a "deep session." There are sessions when I talk about a topic that I normally avoid, which usually involve a lot of crying, but I don't know if that's deep, exactly. Those usually start because the topic is on my mind before I get there. There are sessions when I learn something about myself, or think of something interesting, or feel somewhat more bonded with T than usual. Usually those happen spontaneously, like we're talking and it just comes together somehow. Those seem deeper to me.