When I was younger, I was involved in a long-running, one-sided situation. I blew this guy I knew for a long time, about 2 years. He was "straight", in that I was the only other guy he was doing stuff with to my knowledge. But I feel he was more curious than outright straight. Regardless, I made mention of him sucking my dick once in a while. Usually I would blow him and I would jack off or he would jack me off. One day, out of the blue, he went for it. I hadn't urged him to in a while, having given up that idea. He was certainly inexperienced and to be bluntly honest, it wasn't very good. He still got me off though, because a dick's a dick and still gets stimulated and the thought of him finally doing it was enough, regardless of his ineptitude. That was the one and only time he tried it, he didn't like it. I was satisfied with that, because I was just happy he tried it. We continued doing what we had normally done after that. That all said, I'm willing to bet that your friend is well aware you want him to suck your dick. I imagine somewhere, in some capacity, each and every time you suck him, he thinks about it. That's not to say he's getting closer to doing it, but it's sort of the "elephant in the room" scenario. He may break down and try it. He may like it. He may not like it. He may never break down and try it. If you're ok with the situation as is, I would tell you just keep doing it. He knows what you want, and if he feels the need to try it, he will on his own terms. I would think you would at least want to be jacking off. Even if he's not into blowing you, he would probably allow you to jerk while you blow him, or jerk afterwards with him still around. It sounds like he's not so uptight that he would balk at you getting off; it's just his participation may be minimal, and it may vary.