A human makes a friend who's going through a really really rough time. They get closer and closer as they explore a bit how the other person is feeling, but they only hang out for short periods of time at any given moment and do a lot of their talking through messengers or something like that. They start to spend a bit more time together in person talking about it, and eventually the friend admits the reason they dodge out of in-person stuff is that they're a size-shifter, and emotions can make it act up.
The human knows about shifters, and emotional shifters to a degree. They don't want to seem ignorant and want to be as supportive as possible. They praise their friend for being so on top of their emotions that they can keep it in control even this much! They've spent so much time together at this size! Their friend is a really strong person!
They want to help their friend as much as possible, so they really start to work on being their support so they don't ever had to worry about shrinking again. Their friend seems stable, and yeah, they're a little reserved, a little quiet, a little hesitant, but that's fine! They spend more time together in person. They try to keep their friend as happy as they are when they're usually together, and it seems to work. The friend thanks them for always being there to help them through the worst of it, and they kind of shrug; it's easy! Obviously things can't be that bad, they've never even seen them shrink.
After some time passes, their friend's life changes in a major way. Worried that this might shake the friend up and cause the shifting to get out of control, they insist on being there for them as much as possible. They go to meet with them at their favourite spot and find the friend: happy, relaxed, content,
And gigantic.
And it dawns on them that the reason they never saw them shrink, was because they were already as small as they could probably go.
