Convincing him to Switich the Nanites

I had used some nanites to turn myself into an exact copy of Kelsey for the weekend. I felt.. so comfortable as her... but her boyfriend seemed a little down.
"What’s the matter? Don’t you like the way I filled in for Kelsey on this trip?" I asked.
"You’re doing great, Dan, my mom thinks Kelsey and I are still together and it’s… um… been nice feeling like she’s still my girlfriend. Even though you’re a guy, you’re actually, um… ahem… sexier than her somehow."
"But I’m not a guy… not anymore… the nanobots made me look just like her, but you make me feel sexy when you look at me like that!"

I purred in Kelsey's sexy voice, "You know… I don’t have to take the reversal nanites… we could slip them to Kelsey and she’d have to take my place and I could just stay here as Kelsey with you…"
"And how would you convince me to let you do that?" he asked, but as I pulled his hard cock from his shorts and started sucking he said, "Ooohhh,,,, THAT is VERY convincing, KELSEY!"

As he flipped me over onto my back and I srpead my legs automatically I said, "I never wanted this before… I was always a straight guy… but… it’s so overwhelming! Please let me be Kelsey!"
He chuckled and said, "I love hearing you beg for it! You’re the only Kelsey for me! And soon you’re going to be the only Kelsey anyone knows! We’ll give her your nanites, and I’ll even add programming to make her think she was always you… Just like the nanites I gave you made you want to be the perfect version of her… It’s almost a shame you’ll forget I told you this… but, soon you’ll even forget you were Dan… Now lay back and get ready to be Kelsey… forever!"