Aeonic Quintessential Mana Soul! II
Frankly, Noah could have chosen to give her the recently achieved Complete Golden Aeonic Pearl of Extremity as it would have expanded a Boundary she chose to the 3rd Boundary Layer.
But why do this when there were other methods easily accessible and could preserve his Loot?
He also knew himself and was true to his nature.
He knew that apart from enjoying the wonders of Mana, Reality, and food, he also didn't deny that he indulged in and enjoyed the company of women.
If it was also something that could further increase his strength and theirs, it was all the more reason to do it and enjoy the time one had- whether they lived for a few years or billions of years.
And he had yet to fully test to see what the results would be in the advancement of Boundaries towards Extremity through Dual Cultivation, with now being a good a time as any to confirm as the other party was someone that even had more Boundary Layers expanded than him.