It slides right in

Since you just shit in your diaper a few minutes ago, your ass is nice and slick. Daddy decides you don't need any more cleaning up, and your spit and shit will do nicely as lube.

He picks you up and bends you over on the floor. He pushes the head of his cock into your virgin ass as you see Mommy playing with her pussy. There is a lot of pain, but at the same time, you do like feeling full. You put your hand between your legs to play with yourself, but Daddy spanks you and tells you to take your punishment without pleasure.

As Daddy completely fills your ass with his cock, balls slapping against you, you start to moan. You have never felt this way before, and your cock is very hard. You feel like you might cum without even touching it, but you are afraid you might get punished more.

Daddy starts to pound harder and harder, moaning more and more. He starts to shoot his cum in your ass, which makes you suddenly cum all over the carpet. You lay on the floor quickly, hoping no one saw.

Daddy pulls out his cum and shit covered cock and is about to clean it off, when Mommy stops him. She saw you cum, and now your punishment will continue!