I bet you could get more depth if you figured out how to make that position work for you. Legs together in front of you, seated on the floor. I was tried many time but unfortunately can't reach. Sorry that's made me feel sick I. I personally have managed to get my tongue around the tip of my penis before, but its not something I could achieve everyday.
Lie on stomach, hands at shoulders.
Have you ever tried to lick/suck your own penis?
I bet you could get more depth if you figured out how to make that position work for you. Given the nature of the question's topic, I thought it prudent to specify. Take your time, this is a good one for loosening both your back and your hips. Please try again later. He showed me how to lie on the bed about 18" from the headboard, then bring feet over to touch the headboard, as a hard cock hovers above your mouth, and practice makes perfect. Here's a few starters: