Harry Mikaelson Potter and the Philosopher Stone

In the year 1996, Klaus Mikaelson on a routine trip meets a family who he has called friends since 1948. Learning about a war and a curse Klaus agrees to do a ritual that allows his Genes to merge with the genes of James Potter as the Curse makes it where James's genes alone couldn't create a child.
On Halloween night 2 years later Voldemort and Dumbledore attack the Family's Bolthole with Klaus Oblivated of his memories.

Now, in the year 2010 a year after Voldemort's return and Dumbledore's rise Lily Potter Manages to pierce the veil along with Esther in order to show her Friend and one of the Father of Her child their child and his 4 years at Hogwarts in an attempt to desperately save their son.

The fact that it may give his family happiness is just pure conscienceless.