Talk it over.

"Vincent, wait." You say, your deep snarling voice echoing in the room. Vincent stops surprisingly. You know some of the demon lust has rubbed off on Vincent and he could submit, but you have to work for it.

"What you sick twisted demon?" Vincent turns and looks at you both. Kate goes towards Vincent but you stop her. She retreats and kneels beside you. She takes her hand to your large cock and strokes it as you try to talk sense into Vincent.

"Vincent, I know it seems weird and wrong, but how do you know this isn't how we are meant to be?"

"What? You're sick people, no, demons." Vincent turns but doesn't move.

"You feel that saliva still on your cock. That's Lilith's saliva. And you know saliva is a fantastic lubricant." Vincent feels the saliva and turns back to you and Kate. "Do you like masturbating Vincent?"

"Yes. But not to demons. It's..." You cut him off.

"Well close your eyes and think of something incredibly sexy. Two women caressing your body... Nurses stroking your massive cock..." You instill images that make Vincent close his eyes and stroke his cock. The saliva on him can cause partial transformation but he needs the fluids of a succubus pussy to become fully transformed.

You walk over to Vincent and stroke his cock for him. You order Kate to get ready for penetration as you coax Vincent into submitting. "You love feeling that saliva don't you?" Vincent nods as you transfer his cock to Kate's pussy. "Imagine you are fucking a supermodel doggy style. You grab her hips and thrust. Thrust Vincent. You want to cum inside of her." Vincent grabs onto Kate's hips and she moans, contracting and relaxing her pussy muscles.

As Vincent continues you notice something. His body grows in height and muscular definition. His abdomen sculpted before your eyes and darkened to a tanned colour. You knew he wasn't far away.

"Oh fuck yeah. This pussy is so tight. You like that bitch?"

Vincent opens his eyes and the irises shine a bright yellow as his skin darkens. His cock grows larger inside Kate and she screams. The couple comes hard and Vincent screams a hellish cry as his hair grows longer, his muscles expand and he is completely transformed into an Incubus.