This is a F4M dynamic. M is trying to summon a succubus to help calm his lust, and summons F: an older Succubus with very little self confidence and who believes she is no longer fit to bring pleasure to a young man, for help. Between a majority of the lines, and in some spots in the actual lines themselves, there are brackets that dictate how the listener would respond (non-speaking lines, mind you) or what is happening at a certain point. This is to help get an idea how the next set of lines should be expressed.