As far as I’m aware, Nathaniel Knight has NOT claimed his Twitter account was hacked or that the tweets weren't his. That's Aimee speaking.
Put the address of Nathaniel’s Fur Affinity account (which he’s been scrubbing) into the search field on www.archive.org.
www.furaffinity.net/user/kharonalpua/
Look at his account as it was on 1st May 2015.
There it is in black-and-white.
Nathaniel’s stories are catalogued under his “Gallery” tab, and someone commenting on the, “Wolf's Sexual Adventure: 01 - Scyther Strikes”, story even calls him out for using a 10-year-old character.
I’d recommend the Liberal Democrats take a long close look at Nathaniel’s response to that comment, it’s quite revealing.