Not necessarily "childhood" but I was 16, with the maturity level of a child...
I was at a friends party, the usual high school get together, with a horribly balanced taco to sausage ratio.
Once I arrived my friend warned me of a girl, whom we'll just call Alexis. He told me how "crazy" she was, but I thought he was just being a douchebag as usual. I seen Alexis sitting on the couch alone, on her phone. Now I didn't know much about her, but I'd heard plenty of stories about how much of a whore she is, as a horny teen, I of course view this as a positive quality.
I sat next to Alexis, and made small talk with her, all the preconceived notions I had about her disappeared, she turned out to be really interesting and outgoing, and she was at least a solid 6 (hit and quit material)
Around 11pm everyone started leaving, Alexis said she wanted to get back home, but she didn't have a ride, being the nice guy (pussy hound) I was I offered to give her a ride home. She directs me to her place, in a really nice part of town. As she's stepping out she invites me in. (This is my chance!) I accept while trying to play off how excited I am.
We walk up her driveway, and onto her porch, before going in she tells me to take off my shoes, because if her dad finds out I'm here bad things will happen. I take off my shoes and hide them under a chair for good measure.
Alexis immediately gets to it, kissing me and making advances. To think, yesterday I was wanking to shitty porn, now I'm moments away from fucking a real woman!
She leads me to her room and pushes me on the bed, then jumps on top of me. She yanks my pants down, and I take off my shirt. She stands up for a moment to take her clothes off, then gets back in bed.
We suddenly stop as the sound of the front door opening makes us panic. I rush to get my pants on, falling on the floor in the process.
Picture this for a moment, I'm laying on the floor, pants around my ankles, with my boner waving in the air, and the girl of dreams naked on the bed, we were seconds away from full insertion. This is when I hear someone running down the hall.
My heart leaped from my dick to my throat as a man bursts into the room. He looks down at me, then at Alexis, and back at me.
(I later found out that this man was her marine father. He had found out I was at his house because the neighbors seen me with his daughter, and ratted me out)
Her dad grabs me by the ankle without saying a word, and drags me into the living room, giving me carpet burn on my ass cheeks.
He lets go of and leaves me by the couch while he walks into the other room, I figured he was going to get a bat and beat me to death, I was too terrified to move.
He walks back in, he doesn't have a bat, no not a knife, or even a gun. In his hand is a single marshmallow.
You read that right, a marshmallow.
He grabs me by the throat and lifts me onto my knees, while his daughter pleads with him to let me go, he completely ignores her, and that's the time I deep throated a marshmallow.
Tl;dr Skinny white teen forced to deepthroat marshmallow, by middle aged man, after trying to get lucky with man's daughter.