Was this a genuin kiss or just because he was drunk?

So, I went to hang out with a friend at his house quite a few weeks ago. We've been really good friends for about 3 years, but he's alwas considered me his "little sister", even calls me that on occasion. The most physical he's ever been with me has been hugs, and usually side hugs.

But, this night when I came over he gave me a huge hug and kissed me on the cheek... He also kept resting his hand on my knee/leg while talking with me. I noticed that he was being extra goofy that night too, but was just more confused about how physical he was being.

I found out a couple nights ago that he actually was intoxicated, I couldn't tell that night cause he's a pretty functional drunk.

I've had people tell me that a man's true feelings come out when he's drunk and others who just say men do stupid things without thinking or realizing what they are doing....

Does he actually like me more than a sister? Or, was that kiss just the alcohol?