I have to agree with the above two posts, somehow gifting yourself to him is a very direct suggestion. Kneeling could work, but if that's still a little too forward for you and you would still prefer for him to initiate the scene, maybe you could design a basic 'certificate' or something to present to him which would say that you're his to do with as he pleases for x amount of time. That way, he can take the certificate, put it away somewhere, and get it out again to use when he's ready to engage in BDSM with you and has thought up the scene he wants to create for you etc. Hope I've helped :-) Good luck.