Ending
Lucy and Laxus, along with their twins, Yuri and Layla, were happy together and of course, along with the rest of Fairy Tail. Laxus was a great father to the twins as he promised he would be. After his father left, the only father figure that he ever really had was his Grandfather, and even during his rebellious stage, he wasn't much of a grandson -but he was more of a son to Makarov.
Yuri took after his father - Lightning Magic.
Layla - like all Heartfilia women took after her mother - Celestial Magic.
Years would go on and soon enough when Layal was sixteen she was able to inherit all the Celestial Keys - she made contracts with all the celestial spirits. Of course, Layal would be apart of the same team as her brother - as they trained together and they were able to cover each other weak points. Even on some jobs the two would butt heads - because they would never agree on something.
Though the two would be the best wizards - along with the rest of the Next generation of Fairy Tail Wizards.
This next-generation was still going to prove that Fairy Tail is the one Wizard Guild not to mess with.