It's about a man who is abducted on his birthday and made into a little boy by another man. The man makes him his sex slave and puts a machine ring in his ass to make it tighter. The man has a sex slave party and everyone brings their slaves, some are dog slaves, and some are forced transexuals. I think the title was daddys little boy or something like that. It also has parts in the beginning with him in a diaper

I'm not having any luck locating this. All of the release "Daddy" titled stories don't contain anything regarding diapers or dogs.

I'm not sure, but is sounds very similar to the story, "How I Became a Boy" by desexedboy

Part 1 http://www.eunuchworld.org/viewstory.php?storyid=7548

Part 2 http://www.eunuchworld.org/viewstory.php?storyid=7560

Part 3 http://www.eunuchworld.org/viewstory.php?storyid=7564

Part 4 http://www.eunuchworld.org/viewstory.php?storyid=7566

the title may have also been something containing little boy, or anything with references to a little boy and a daddy

I want to know too. Seems interesting.

Sounds a little like Oh Boy by ihad

https://eunuchworld.co/s9265