Penis in my Mouth

I am lucky enough that I can get the head of my penis in my mouth. I can do this by sitting on the edge of my seat and just leaning forward. I lean over and stick the head in my mouth and go up and down on my penis. This doesn't give me a lot of pleasure so I stroke along my shaft with my hand. After a while of doing this I feel the familiar feeling that I'm going to cum. Most of the times I don't want to cum in my mouth so I pull out and shoot a huge load all over my chest. Every once in a while I will be really horny and just shoot it into my mouth and swallow.