"Only you can see us in that mirror right now, Honoria. I can't, but I've seen you nude, and clothed, and I'm willing to bet you're a fucking vision."

Wait for it. Erin lets Crabb get into the rhythm of the stretching, and when she's sure her girlfriend is quite into the repetition of it, the fabric over Crabb's nipples tightens and pulls. It's not quite the same pressure as Erin's fingers, but it's quite a lot for cloth - and it comes with squeezing her breasts as well.