Well, trying to do it while sitting upright in a chair would be quite a challenge, because as we all know, after you get off, the desire to eat your own cum diminishes greatly, but.....if you wanna try something different....I've used this with success in the past, and it gives you alot of options to add your own style to it. Hope it helps!!
Basically, invert yourself however you want, up against the wall works. Ive used this method in conjuction with tying my ankles to something behind me, such as legs of a dresser, bedposts or whatever, you dont have to, but if you wanna be helpless, its a must.
My method is fairly simple. First, find a 1 liter (or similar) water bottle, basically the tallest water bottle you can find and cut the top off of it so its like a big skinny funnel. Now, i take a regular kitchen funnel and taped it inside of the waterbottle, so the exit of the funnel is directly over the opening of the bottle. Following me?
Next, either with a ring gag or without, you tape the drinking end of the bottle inside your mouth. I use one strip of duct tape around the back of my head and then another wrapping it around the bottle itself so you cant spit it out. See where this is going?
Then, setup your inversion and stimulation however you want, and if you have a bottle tall enough, your dick will pretty much be inside the funnel so its impossible to miss! and the funnel will ensure that all your cum drips straight down into your mouth without getting stuck on the sides or anything!
Thats it! and again, feel free to contact me if theres any confusion on how this is done. Hope it helps!
"Dress me up like a Slut...Tie me up Tight...And im in Heaven!"