How do I ask him ?

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So I’m a total freak and my boyfriend does all the stuff I like but he’s way more vanilla then me but I love being tied up, choked, hit, spanked, whipped, degraded and just tossed around and he’s ok with all that he’ll do it cause I like it but I really wanna ask him to start cutting me like on my back and thighs and maybe stomach but I’m not sure how to. How would y’all ask a question like this ?