How do I sit on his face?

My boyfriend wants me to sit on his face, he said it turns him on.

I want to try that but feel a little weird like I might sufficate him...:S I don't there a way to sit on a guys face that would turn him on more than just sitting on his face?

This is a weird question, did not know how to ask it...I hope it makes sense.
How do I sit on his face?
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