Here is my diaper related fantasy. Just up the road from where I live is a garage that services cars, does MOT's etc and a while back I had them do some work on my car. There is a young guy that works there, I guess he's about 22/23 years old, he's not particularly tall, he has dark brown hair and bright blue eyes and just the faintest outline of stubble around his face. He's very good looking in a boyish way, he's not fat but kinda stocky, he still has what I would call the look of puppy fat about him. He's the kind of guy that if he had been your son and had been naughty growing up, you'd have had no issues with giving him a hard spanking on his bad boy bottom but his puppy dog eyes and cute face would soon have had you giving him a cuddle and reassuring him that everything was gonna be OK. Anyway when I saw him the other week he was wearing a dirty and greasy pair of tight fitting all in one denim overalls and he smelled strongly of engine oil, a smell I have since realized I find a massive turn on. Without him knowing, the lad gave me a throbbing boner in my pants lol! Anyway, my fantasy! I imagine that under his oily smelling faded blue overalls he is wearing a diaper and plastic pants. Because of his size and body shape it is quite clear to everyone that he is wearing a diaper and when he moves around the slight crackling sound from his plastic pants can be heard. He's aware of this and he is embarrassed about it. As he's working on my car he lets out a soft fart, it's not loud but it smells real bad. His boss who is working on another vehicle shouts out that he needs to go and take a dump because he's stinking the place out and being the good young man he is, he slopes off to the outside lavatory. I follow and as he opens the door and enters, I quickly slip in behind him and lock the door, removing the key and putting it in my pocket and out of his reach. I'm really turned on by humiliation. I sit down on the toilet and have the chubby mechanic come and stand in front of me. I ask him if he needs to take a shit, that from the smell of him he does and I think it's a massive one that needs doing. He nods at me bright red in the face and glassy tears well up in his eyes as he tells me he's constipated and been made to wear diapers by his mum who he still lives with. He starts to fiddle with the front of his overalls in his crotch area, I smack his hands away and make him stand up straight. I tell him I want to smell the back and front of his overalls to see if he has wet or messed himself and I want to feel his stomach to see if it is loaded. I pull him close to me and proceed to inhale deeply against the seat of his oily coverall while pushing my hand against his doughy but clearly fully loaded stomach. I notice the faint smell of shit emanate from his backside and likewise at the front the acrid and slightly ammonia smell of his piss, mingled with the smell of engine grease. I run my hand across his groin and lightly grab his manhood, rubbing it through the plastic pants and diaper and I feel it immediately respond to my touch. Bending him over very slightly I run my hand over the taught but clearly clean diaper and pat it firmly several times, hearing the satisfying crinkle of his rubber knickers as I do. Not hard enough to be a spank but enough to let him know that that might be an option. I tell the guy to give me his mobile phone and get his mum's number up. "You're gonna pack the hugest toilet you've ever done in that diaper right now and when you're finished you're gonna call your mummy and tell he what a big boy you've been - got it?" He starts to tremble but nods slightly. I have the boy shuffle closer to me to stand right between my legs slightly sideways on, I reach between his legs and part them ever so slightly and then I rub my hand up and down against the seat of his overalls. "Push hard and look into my face" is the command I give him. He squats a little and he begins to push. Nothing happens except for the escape of a little foul smelling gas mingled with the heady scent of engine oil, I dig my nose into the rear of his diaper and smack him fairly hard at the same time. "PUSH!" He leans his weight against me and slowly and with great effort begins to grunt and moan. I start to slowly feel the seat of his overalls firm up, tighten and then begin to bulge out. A thick and solid mass starts to build, I feel its warmth against my hand and to make his job of shitting himself just a little harder I push back against it. I can tell he's in pain. His face grimaces, he is bright red and a shimmer of sweat is clear to see, his eyes glassy and bulging and his hair damp. "Push!" I compel him. Now his diaper is beginning to balloon out, my hand pressed against his bottom being pushed away from him and the stink in the small, enclosed, urine smelling lavatory is overpowering and sickening - my dick is rock solid. My young mechanic continues to struggle and strain, continues to shit himself like he's never done before. He hates his captivity, his being compelled to mess himself for me but he knows there is nothing at all he can do. I delight in his discomfort. Eventually the diaper is packed solid with his thick, Plasticine like load, his stomach is flat and soft to my touch. I can feel the ample weight of the solid mess in his pants. His solid mess! He sags in relief but as he does I pull him down across my lap and begin to methodically hit and pound the protruding lump and the seat of his oily and grease infused overalls. I doubt that hurts him although he cries out. After all his tender bottom is covered first with a thick layer of his own stinking excrement and overlaying that is the soft and ruined layers of his padded diaper and plastic pants that make him feel like the toddler he once was and his embarrassment is palpable. I spank and rub and mush the shitty mess all around, deeply massaging it into his chubby crack and up around his throbbing manhood. He stinks. He cries out, defeated as I feel him shoot a no doubt thick and sticky mess into the front of his oil covered overalls. I hold him steady for a while to compose himself and I tease him with the fact I'd said he had to call his mother to tell her he'd messed himself but hey I'm not a bully, so I just say "come on". As I take him by the hand and lead him from the outside toilet and back towards my car. His boss looks across and shouts 'Just get on with the car lad or I'll come and give you something to concentrate your mind" His boss would spank him, of that I have no doubt. The young mechanic feeling sticky and stinky goes back to work on my car. He looks across at me once or twice but I ignore him. Eventually the car is ready. The boss takes me into the office to pay. "I think you'd better deal with that young guy" I tell him. "I've been watching him, I think he needs to take a dump" That's where we're going right now the boss tells me as I get into my car and drive away.