Sexy ways to initiate sex?

I'm going to initiate sex with my boyfriend for the first time. We've had sex three times and now I want to give him a surprise. I'm usually not very sexy so I think this would be unexpected. So what's something sexy or cute I could do? Please don't get too crazy I'm still new to this and trying to learn how to be sexy without falling on my face.
Sexy ways to initiate sex?
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