I am more the opposite, quite wary of bringing up new and sensitive topics towards the end of the session and prefer to be upfront and jump straight into whatever I want to discuss at start. I know that both my T and I can easily get distracted and drift all over the map if we let it so what I often do is send an email summary of what I want to discuss prior to the session. Sometimes several during the week and then we typically pick the most recent topic. Often I need to remind T to stick with it as he kinda likes bringing up thoughts and questions on his own.