What counts as a hug in Fruits Basket? Near the end of the chapter in which Momiji first appears, he put his arms around Tohru's waist, but didn't transform. And many of the events that transform the zodiac members look more like tackles or bumps than hugs. So what, specifically, are the specifications for a &quot;hug&quot; that will transform a member of the zodiac?
From my recollection, the determinant seems to be the non-zodiac member's arms going around the zodiac member's body.  Intent doesn't seem to matter -- that's why you'll get tackles and bumps in there -- just the specificity of action.  So that's how Momiji can hug Tohru -- it's just that she can't hug him.