Parental Voldemort, sassy Harry

It’s been years since I’ve read this and I can only remember a specific scene, Harry is in an office with Voldemort and Voldemort has taken him under his wing for whatever reason, Harry is now an equal with Voldemort yada yada, and snape and other death eaters come into the office and are shocked when Harry sasses them and Voldemort does nothing.

I know this isn’t a lot to go off and actually quite common im sorry. Just throw whatever you’ve got at me please 🙏