Advice please! Sexy surprises

So I'm seeing my boyfriend for the first time in 2 weeks this weekend, I wanna do something sexy to surprise him. When we have sex it's not vanilla or anything like that, we try heaps of different positions and I take over from time to time, but I really wanna take initiative and do something that'll shock him, make him feel really wanted and stuff like that. He's  picking me up  from the train station near him so I was thinking maybe something in the car? I don't know how to initiate it though! I'm too shy! Any other sexy surprises I could whip out in the bedroom? Please help me out ladies, tell me sexy things you've done for your man!