Both Sasuke and Madara's Sharingan awakened/evolved after they

Hokage 火 影 - Hokage 火 影 added a new photo.

All Mangekyou Sharingan awakening [Indra, Madara, Obito & Kakashi, Itachi, Sasuke] Explanation !

How did Sasuke get the Rinnegan? Here's what you should know

Would Naruto awaken the Rinnegan if he takes the Sharingan from Sasuke? - Anime & Manga Stack Exchange

Naruto: Top 14 Strongest Mangekyo Sharingan Users, Ranked

Is the Sharingan destined to die out? With sasuke and sarada only being the ones left, eventually the sarada line with dilute? Unless sasuke gets hoes? : r/Naruto

Would Naruto awaken the Rinnegan if he takes the Sharingan from Sasuke? - Anime & Manga Stack Exchange

Madara Stabs Sasuke! Gaara's Plan – Naruto 661

Who has the Eternal Mangekyo Sharingan?

naruto - Did the writer mention that 2 Tomoe Sharingan can instantly awaken into Mangekyou Sharingan? - Anime & Manga Stack Exchange