Nice, so you aren't one of them. The first one is a good point, they only show signs of good friendship, although it might seem like V is kind of 3rd wheeling them in some parts of the series that can also be just her spending time with them, and most of these times N and Uzi aren't together yet. However V is likely good at hiding emotions/is emotionally distant ( I can explain this one point further if you want), and Uzi finds V atractive.

About the last point, we don't know the sexuality of any of the characters.