looking for a story

Story by lightning4tiger

hello, I'm trying to find a story I've read some times ago but I don't remember the title :

There was a dominant futanari and a sub boy. She was training his ass with bigger and bigger dildos. At some point she makes him sit on an enormous dildo and order him to get it fully in by the 3h mark. he doesn't succeed so she helps him by pounding his throat into it. in the story the futa is also very rough when fucking his throat with a dildo and her hand. I remember there also some form of bondage.

thanks to whoever makes me recall the name of this story