Vegito Versus Buu: The Battle Within - Chapter 6 - Super_Buffed - Dragon Ball [Archive of Our Own]
Life With You - Chapter 1 - ElisaJ - Dragon Ball [Archive of Our Own]
A scene from my (mostly) illustrated Dragon Ball Z fanfiction on AO3 called "Touketsu". In it, Vegeta is changed into a demon and proceeds to wreak havoc with his new, dark energy.