Could be AU. Everyone can see they're in love with each other. But they don't make a move, and the UST is up to epic proportions. Real!Graves tried to make a move, but it was too ambiguous. Newt tried to take the next step but was overcome by his shyness and low self-esteem.

I know this is cliche, but I hava a might need and I will give my metaphorical soul to anyone who fills this!