I agree with Mython's definition of intimacy soundstage wise. The way I see it, in my own words, is that indeed for the SE5, lateral spacial clues place instruments and voices quite close together and not too far from you. However, you never feel any "stuffiness" to the sound thanks to great separaration and precise placement, and a certain sense of depth.
Some other iems, for instance Fitear 335, seem 5o create intimacy because of the fullness of their sounds, mids and bass are so rich that they seem close together....like fat people in an elevator. This intimacy may seem more claustrophobic at times.
There is a last aspect more often related to the recording but sometimes enhanced or modified by colored iems, and non exclusive to the other twoo aspects, which is (artificial) proximity of voices. When you hear the singer whispering in your ear, there can be a feeling of intimacy unrelated to the width or depth of placement of instruments.
Always enjoy reading your posts.. Always