Eeep. At least personally I could never ever see myself with an e2 in an LTR. While a 9 with a heavy wing is more plausible, I think 6, 7 or (a very specific) 8 would be strong possibilities too. 2 and 9 tend to be more passive than I would desire in a SO. I need an equal who can speak (and receive) truth in love. I know 2's and 9's that I adore, but they generally have the tendency to appease me and hide their ill-feelings (until they erupt later). I could not live with that day-in and day-out.
That being said, I only know one male 2 and two male 9's IRL so I'm sure there are individuals that would surprise me.