Train-track seams

That's more like it dear - there's nothing worse than a slut with crooked seams. And from now on you'll have to learn to straighten them yourselves, because I won't be doing it for you.
And if you think that means you're getting away easily then you're dead wrong. Every time I find your stockings have been poorly-adjusted, you'll be going over my knee for a spanking.
I love the way seamed stockings look as though they're pointing straight up to your cute little bottom. They remind me of train tracks.
And if you're very good, I'll show you my big black locomotive... just bend over that chair and spread those coltish legs for me.
That's right baby - I love how you tremble and totter on those darling shoes.
Are you prepared for me? Because my train's ready to enter the tunnel... and I really don't care if you're ready for it or not!