when koko falls asleep before meimei :-).
Whenever the kids get hold of stickers, they will be bestowing stickers to each other, "I-stick-on-you, you-stick-on-me" manner. Save the best and biggest for last. It's one of their actions of affection :-).
So here, meimei is trying to say "I love you" to her sleeping koko :-).
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