You've always had the flexibility to put your legs behind your head comfortably, and recently you've become fascinated with the idea of sucking your own cock.
You're always careful to slowly warm up and stretch, and you can take it pretty deep. That's not the issue. The issue is getting over that mental hump of choosing to suck to completion. As for swallowing, it hasn't even crossed your mind. Even though it seems hot conceptually, after getting into position you always lose interest long before cumming.
But today something feels different.
As you stretch and get into position, with your face just inches from your thick, erect dick, you hear a new voice in your head. Not your usual internal commentary, it's a more playful, chiding tone, and more feminine.
It's telling you to think about that thick cock in front of your face not as if it's your own, but as if it's the perfect cock of some faceless stranger. You're strangely turned on by this. You don't consider yourself gay, and sucking another guy's dick doesn't really appeal to you. But the submissive part of simply pleasuring a nice-looking cock has become insanely attractive. And now you don't need to involve or mentally accept another guy! You still know in the back of your mind it's your own cock.
Thinking about it like that - that the cock in front of your face is separate from you, and that it's your job to pleasure it, is turning you on like never before. You had never thought about it like that.
And now that voice in your head has become like a woman there in the room with you. A woman who is guiding you on your journey to properly suck this cock sitting right in front of your face. You can feel her glee as she pushes you past your boundaries, to become a cumslut for this massive dick.
This is her (i.e. your) narration and direction to yourself, as she talks you through thoroughly sucking that cock for the first time:
------ The Direction -------
Holy shit.
His cock is fucking massive. And it's right in front of your face.
you realize you're gonna have to suck it right?
Like it's your job to please that massive cock.
And when he cums, it's gonna be balls-deep.
No no, there's no other choice.
Your nose is going to be buried in his nut sack while he pumps a massive load straight down your throat
I hope you can take it!
It's gonna be a lot of cum.
Well, time to get started.
Get your lips around the head of his cock, and get to work.
Holy shiiiit this is so hot.
Even sucking just the head, it's filling up so much of your mouth.
When he's deep, you're going to be stuffed full!
And don't forget his balls.
You need to get them ready to cum too.
Better suck on them a bit so he can cum as much as possible!
Now back to his cock and let's see how deep you can take it.
