Sweden isn't going to object, but he might be getting slightly red ears here. It is normal for Finland to touch him - they touch all the time. It's normal for them to see each other half-naked, hell, even naked, because saunas and swimming are a thing. It's normal to be closer, they sleep in a bed for heaven's sake.

But recently... recently he will get a different kind of flustered in the oddest situations.

There really shouldn't be anything unusual in this, but there is, and it makes his ears flush - the first step of a flush for him, always. It will start there.