How do I go about trying this kink with my boyfriend?

Anonymous
So I like to tease my boyfriend with my booty. (Twerk on him, telling him to kiss it, etc) And he gets very flustered by it. He's a very shy and respectful person, and I love that about him. I've been wanting to sit on his face. Not as in a sexual eat me out way, more of my booty will be on his face. I bought a thong for the occasion that I've been keeping a surprise. (I also bought this type of oil my friends told me about that I can put on my booty to make my butt cheeks nice and slick) But how do I go about asking him to let me do it? I don't want to just say hey I'm gonna sit on your face. Cause then he'll feel pressured into it, I want to be smooth about it. Any ideas?
How do I go about trying this kink with my boyfriend?
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