Murdered Love [A Dusttale x Undertale Sanscest Story]

Dust [Dusttale Sans] kills so he can become stronger and defeat Chara. When everyone in his AU is dead. He finally faces Chara/Frisk. But instead of winning, he dies and loses. Now, what can he do except go into another AU and start the cycle all over. But how could he do this with an unfamiliar emotion constantly buzzing in his mind?