When I was about twelve I made a serious effort to suck myself. Masturbation was something new for me, and overwhelmingly exciting, I got myself off several times a day and experimented with every way to stimulate my penis. It seemed like a logical next thing to try.
I was slim and flexible, far more so than at anytime since, so it was my best opportunity to achieve the ultimate solosexual act. I tried every position I could imagine, rolling around on the bed or floor, naked and erect. I forced myself to hold very uncomfortable contortions for far longer than reasonable, hoping I would gradually gain more flexibility.
The closest I ever got was to touch the tip of my extended tongue to the pee-hole part of my penis. I could flick it lightly, just enough that I could feel that contact was being made. It was an exciting idea, but it wasn’t really pleasurable, and the awkward position made it hard to enjoy.
I decided that for it to be worth doing I would have to be able to get most or all of the glans into my mouth and suck it. Then I could lick and suck and probably enjoy it. But I never got closer than an inch away from that goal, so I gave up.
It was a long time ago, but I still remember that brief moment when I ever so lightly touched tongue to penis.
Source: I Want To Suck My Dick – Page 2 – Onania Masturbator Forum