Xander decided to go whole hog, starting with himself.

'Okay, time to make me the best Xander I can possible be!' he thought as he used the stones to change himself.

First, the physical. He made himself the peak perfect physical human being ever. Muscles which looked like a cross between a body-builder, athlete, and martial artists in perfect balance. He made himself the most handsome form of himself, as if he had been born without a single ugly flaw. He also made it so while his cock was about long and thick, he also made it so he could adjust it naturally to fit the woman he was having sex with perfectly for her.

The mental began. He was smarter, even if his mind was the same goofball he had always been. An encyclopedia known of all things and great analytical skills was the mind he had now, even if he could make mistakes with those abilities. He also had a natural knowledge of social and personality cues. Giving him the ability to understand, lead, seduce or even manipulate others around him for his purposes.

Sexually, he now had the complete knowledge of sex for humans and all other sentient life in his head. How to play another body sexually like a fiddle from hell. His cum was now delicious to whoever tasted it, he made pheromones which could arouse as well as excite with a side effect of making those affected suggestible, and could know how to please a person by looking at them.

He then made some supernatural changes to himself, making himself equal to a Slayer as well as a master of magic. Plus some other surprises. Then finished by making people just accept this as the new normal.

'Okay, I'm maxed out. Let's see what the girls think and if they want me in their bed, maybe it will keep my mind off sex long enough to use this better.'