How to get him in the mood for oral sex?

Well me and my boyfriend are pretty close, he goes to a different school than I do, so I don't get to see him every day. But I do to to his house every weekend, and we just watch tv and makeout on his bed. I've never givin a blowjob before, but I think...

it would be fun to tease him a little. When we makeout he always touches my boobs and runs his hand Down the back of my a$s. I would like to kinda get him in the mood, but I don't really know how to do it. I mean he gets really hard and stuff while were on his bed, but I don't really know how to tease him into it. Have any ideas to what I could say or do to get it started?

man I hate when girls tease me because once it feels good, I want her to keep doing it lol...but try pulling his pants down and give a quick little suck and then go back up and kiss his neck or something. he'll most likely be thinking, hey why you stopped for? lol...but yea us guys are always in the mood when it comes to blow job lol.