1) How would you gag me? Ball gags are nice and foolproof too (imirtant if we're talking about me doing the gagging

)
2) How would you bind me? In your case, a spread-eagle sounds nice. Secure without covering up too much of that slim body of yours, which I'd want to look at and admire... if not envy.
With what? Chains with thick, padded leather restraints that are padlocked on. Comfy for long periods but also secure.
what positions? Spreadeagle on a bed so you can stay relaxed, and notice it when I torment you. Bwahahahahahahahaaaaa.
3) What would I be wearing? Shorts; maybe Speedos if you like. Not naked though unless you spcifically requested it; not too sanitary really, and wearing something limits the 'fallout' in case of 'accidents' like bed wetting. Of course, naked would put other ideas in my head; maybe we'd better not go there here.
4) Would you do anything to humiliate me?
Sure! I'd take lots of digital photos (though I'd show them to no one else; they'd be all mine); bathroom breaks might be supervised, hand-feed you rather than let you feed yourself; plus anything I figured you might actually like. Nothing public though; I hate that.
Dare to be different... and make a difference.
To boldly go where no one in their right mind has gone before...