I gazed steadily into Xavier's clear blue eyes as I watched him look at me with a love I cannot describe. His soft lips pressed into mine gently, making me shiver slightly. I smiled against his lips as I slowly dissipated into another world, a world where everything was unflawed and a world where I was unreachable.

I gazed steadily into Xavier's clear blue eyes, seeing him look at me with a love I could not describe. His soft lips pressed gently into mine,  causing me to shiver slightly. I smiled against his lips as I slowly fell into another world where everything was unflawed and where I was unreachable.

"I gazed steadily into Xavier's clear blue eyes as I watched him look at me."
^^^^
What? Gazing in his eyes while watching him looking? That's a very confusing sentence. Who's looking, watching, gazing? Okay, so the main character is gazing into Xavier's eyes, and she's watching HIM looking at HER. However, gazing is mostly = to watching. So what's funny is she's gazing into his eyes while watching him look at her. Does it make sense to say, "I looked steadily into Xavier's clear blue eyes as I looked at him looking at me."? No, no, no!

" I cannot describe."
^^^^
Wrong tense, gurl. It should be could not, not cannot.

"His soft lips pressed into mine gently"
^^^^
This just sounds weird. I'm not quite sure why, but I fixed it to sound better.

"Making me shiver slightly."
^^^^
Making? Such a hard sounding word for such a soft sounding situation? This basically falls under using beautiful language and sentence structure. The word "making" being used there, sort of brought me away from the softness and sweetness of what I was reading and made it all seem... different. It's quite hard to explain, but yeah.

"His soft lips pressed gently into mine,  causing me to shiver slightly. I smiled against his lips."
^^^^
Don't use the word lips in two sentences right next to each other. It makes it seem choppy and just grossnasty.

"I slowly dissipated into another world, a world where everything was unflawed and a world where I was unreachable."
^^^^
I don't like the word "dissipated" there. Dissipate means to disperse or scatter. I don't know. It just seems weird. I changed it.
 I also don't like the fact that you said world three times. Sometimes repeating words makes the statement stronger, but here... NO!