my burning soul of vengences ( male betraye reader x Fate stay night &fgo)

why...why did they do this to me? i had a normal life...a Family, a girlfriend and even my bests friends who always at my side, Taken away and frame by no reason, they torture me for weeks and even 9 years even they cut my arm off for being a "naughty", i was about accepted my Fate until...a demon spoke to me, he felt that pain and want a Deal with me...at first i refuse His deal however, my so call " friends" and " family" ....they still haunt my dreams that my soul begins to burn up with rage,hatred,...wrath, they took my innocence....i want them suffer as i did from the hell prison! so i accept the deal from the red demon and Now...my vengence....has begon