see the thing is if the scenario is specifically a “tiny” tiny, and a “big” that is contextually normal-sized (ie human finds fairy) then you get the gift of the tiny being afraid, and the human experiencing pure wonder at finding them. There’s some work that the human has to do to convince the tiny they aren’t in danger, but it’s mostly them containing their excitement and curiosity for the benefit of the very small being they just found.
But if the scenario is a regular sized tiny, and a giant that is contextually BIG in their world, then not only do you have the tiny one being afraid and freaking out, but the big one ALSO afraid and freaking out because they know they’re the outlier, they know they’re making the human feel small and helpless and there’s no context where they can exist without being scary or overwhelming to regular people, one way or another. Gt with a contextually-small tiny is soft and comforting and wonderous but Gt with a contextually-big giant just goes that extra step with the fearplay. Don’t even GET me started if the big wasn’t always big, and is transformed in front of their friend/s to the horror of everyone involved
Thinking about tinies feeling bad that they can't do more for their giant friend/partner.
Like, the giant can protect the tiny physically from danger with their massive size, but also comfort the tiny, hold them in their arms and hands, hold them to their chest to warm them up, rub and massage their back with a single finger, carry the tiny over long distances so they don't have to walk, etc.
And what can the tiny do for the giant? They're too small to protect them in any way, or to give them a proper good hug or massage. Obviously, carrying them or warming them up with their body heat is out of the question. They could comfort the giant emotionally, but in most cases that's what the giant is doing for the tiny, and the tiny wouldn't know how to do that anyways.
So the tiny feels like they're useless to their giant, and they're a bad friend or partner for them because they can't do anything for them, regardless of if the giant feels the same way. And when they end up talking to the giant about this, the giant holds and comforts them, making them sure that they don't need to be useful or do anything for the giant to be important to them, and that they care for them no matter what.