See if this sheds any light on the subject.
I made these lips real quick and found the reference image afterwords, but I think it conveys the loopage idea I'm talking about. I just find the edges to be a little more rounded and they have the dimple at the end which dissapears when you pucker.
I think ideally there are two creases that can occur on the sides of the mouth. One is at the edge of the mouth where the lips meet the skin and the second is a result of the mouth muscle underlapping the cheek as it expands out.
Anyways take a look at the loops here..

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