What does it mean when a guy spontaneously kisses you?

I really like this guy Drew who's friends with my best friend Matt (name's changed for security reasons). I was at Matt's house with him and two other guys. Matt, drew, and I were all watching Sweeney Todd but eventually got bored of the movie and started wrestling. While we were wrestling the two other guys come in and wrestle with Matt and i look at the couch and find Drew lying there on his back. I run up to him and jump on him and he starts tickling me like he has been all day. He stops and we're just sitting there laughing and then we both stop and are looking into each others eyes. He, very slowly, starts leaning in and I'm thinking "Oh my god is he about to kiss me?" and he does. Kisses me right on the mouth. It wasn't just any kiss it was heated and had tongue and sexy. When we pulled apart I missed the feeling of his lips on mine and wanted to kiss him for hours. The rest of the night me and him always sat next to each other and he let me sit on his lap and while sitting I could tell he was not small in his nether regions and he was kind of excited (; When we were outside I expressed how I am afraid of the dark and he says he'll protect me. The rest of the night i couldn't stop thinking about the kiss or him. When I went to sleep last night my dreams were filled with him and lots of kisses. Does this mean he likes me or was it just a spur of the moment thing?