I'm on board with the rest of the group. Man cum should be injected directly INSIDE. For me, my favorite is to watch full body fucking. Seeing both bottom and Top. Then, I want to hear the Top say how close he is - how good it's going to feel the shoot his seed deep in that wanting ass. I LOVE watching the Top cum when he's balls deep. The look in his face, his tight muscles, and when you catch the cock and balls pumping that hot load...FUCKING HEAVEN! The first/second shot is usually the most powerful...that should NEVER be wasted outside. If you're going to feel it, those first two shots are what you're going to feel. Plant it deep and keep it there.
If you want to see cum pushed inside a wanting hole, let the bottom cum first. Then, take his own cum and lube the Top's dick and his hole. That fucking makes me crazy.