Voluntary intoxication is not a defense to rape or to unlawful sexual intercourse with a child under 17 in Texas. Being asleep and awakened by a 14 year old doesn't even pass the smile test. You need to hire a TX lawyer experienced in these matters if you have been or suspect you are about to be charged in this matter.
This is a complicated question. There is no defense based on age; for the three defense to apply, the adult would have to be less than three whole years older than the child. It is certainly possible to imagine a set of circumstances where an adult who became intoxicated, passed out, and awoke to find themselves having sex with a minor. However, it is going to be a tough sell to a prosecutor and a jury that the 14 year old initiated the sexual contact while the person was incapacitated; most people will think that the adult had at least something to do with starting this off. As Mr. Kaman indicated, voluntary intoxication (you chose to consume alcohol) is not a defense to a crime in the State of Texas, so that doesn't help you out either.
I would agree with my colleague and encourage you to speak to a local criminal defense attorney as soon as possible. Stop posting information about your case online; it could be used against you in an actual prosecution.
This question illustrates why it's better to talk to a creative lawyer who practices in the area where you might be accused, rather than someone giving cookie-cutter answers from (for example) California.
While voluntary intoxication is not itself a defense to criminal charges in Texas, every crime in Texas requires a voluntary act. The drunk 18-year-old may have a defense based on the sexual conduct being involuntary.
Hire a lawyer to advise you before talking to anyone else about this situation. Anything you say to anyone other than a lawyer will come back to bite you.