I was enjoyed watching your cock while stroking and then when the side view came up, I loved the shape so much I came like a teen. Not handsfree but still very satisfying.
Hmm - it's really not that hard. I've done it standing in the galleria at the mall, or standing at the sea wall at the harbor. I love the feeling of the cum running down my leg. Usually only takes about 15 minutes start to finish - though sometimes I like to prolong it.
Being horny helps. Seriously though sex is 90+% mental. Having a vivid memory or a strong imagination is most of the battle. Seriously guys how many times as a teen did you get so turned on you accidentally creamed yourself?