Harry has a soul bond with none other than the Weasley twins, Draco is coming into his inheritance and is the submissive mate to Neville Longbottom. Voldemort tries to come back to life during the Tri-Wizard tournament and instead gets the body and mind of a baby aged one. He gets adopted by Harry and the twins, when all of his Horcruxes are destroyed.

Harry finds his three mates in Remus Lupin, Severus Snape and Sirius Black. He defeats Voldemort withing the year but something goes wrong and Tom turns back to a baby, the same thing happened to Albus Dumbledore. With him being essentially defeated, the mark is gone and the prophecy fulfilled, Tom Riddle takes Voldemort's place. With the quad as parents what can go wrong?