It's a big dildo

"I bought a big dildo for Emma, so she can fuck herself when she's watching you fuck me!" Samantha tells you. You're glad to hear that Samantha sounds completely ready to fuck you in front of your girlfriend and you tell her that's a great idea.

You wrap the present for Emma and give it to her that night.

You give it to her with a lot of fanfare.

"It's not even my birthday!" she says grinning.

She carefully opens the wrapping paper and then opens the discreet box it's in.

"Wow, it's really big!" she says.

"It's the exact size of my dick," you say.

"That makes sense, you're huge!" she says laughing.

"It's for you to use on yourself when I'm fucking our cuckcake," you say excitedly.

"Cuckcake?"

"A girl we bring into our bedroom for me to fuck. She's called a cuckcake and you're the cuckquean."

"Cuckqueen. I like the sound of that, very royal," your girlfriend says and you don't correct her.