Waiting under a lamppost

Tommy's just trying to survive high school. With no friends and an abusive family, he can't take having the weight of the world on his shoulders anymore, it's so heavy. He wants nothing more than for it to finally crush him.

That is until the local serial killer accidentally saves Tommy's life, giving him a reason to keep living and a million more reasons to die.

or;

That fic where Tommy is suicidal because sbi are terrible family and Tubbo ditched him. Ranboos a serial killer who meets Tommy and becomes possessive. He will do almost anything to keep the suicidal boy alive. Almost.