Ch. 22: half-decent spanking as punishment.
Ch. 52 : There won't be a third time. (They got back together.)
Ch. 57 : The creators notes on the work and Q&A. The process of creation is explained. Haven't read it yet. Also includes artwork from other authors and one of their titles. Could choose a story to read based on that.
Ch. 70 and 71: Everyone just showing up!
Ch. 74.1: scolding (The second story)
Ch. 78 : spanking and bondage (The second story)
From Points of Three