You tell your fiancee to watch

You turn to face Lily, and you meet her eyes. Her expression is hard to read. You can tell she's more than a little uncomfortable, but her cheeks are also flush with arousal. You lean in to whisper in her ear.

"You offered me to be with other girls, and I love you for it. You mean the world to me, but you'll never be able to give me a tit-job like she can. And look at that wide mouth of hers. I think she can actually take all of me in her mouth. She's hot, and I want her. You just sit and watch as I enjoy myself. Understand?"

Lily stares at you, unable to speak. But she nods her head nervously, letting you know she understands.

"Good girl," you whisper, kissing her on the forehead. Then you turn back to Rachel, who is looking at you with unbridled lust.

"On your knees, young lady," you whisper to her.