Keeping baby in line. More to be found in the link in comments

He's keeping me in line

Walking the line of seduction, keeping up

Walking the line of seduction, keeping up

Walking the line of seduction, keeping up [oc]

keeping you in line

I believe in a good spanking to keep the bad girls in line!

A Spanking A Day Keeps Me In Line

Get in line

Daddies Have Some Unorthodox Methods of Keeping their Step Daughters

Keeping her in line: Part 1 (Paddle)

Keeping her in line: Part 2 (Belt)