Use the dildo in Sophie’s ass

You examine Sophie's pussy - the dildo's still churning away merrily in there, and Sophie's labia are swollen and damp. She's writhing now.

You remove the dildo. She sighs audibly, in a regretful tone.

Sophie eyes the dildo you're holding nervously.

“Where should I put this, honey?” you ask. “If you were a good girl, maybe you'd deserve to get it up that twat of yours. But given that you've kept this whole side of your personality secret from me for the past year, I wouldn't say you're a good girl. Are you?”

Sophie shakes her head slowly, a little afraid.

“Show me your ass, slut,” you command. Sophie lowers herself onto her hands and knees.

You slide the dildo along her pussy, which lubricates it - damn, she's soaking wet! - and then align the tip with her anus. With firm, slow, even pressure, you slide past her sphincter and into her ass. Luckily, the dildo flares near the base, so after a final push, it pops into place.

You turn it on, and enjoy Sophie's sudden tensing as her bowels are subjected to the dildo's vibration.

“Hold that, dear, until I remove it.”