I saw a porn photo of a guy standing over a kneeling female, his cock angled down and stuck into her slot.  Not only did it show the penetration excellently, but the pose was hot and the downwards angled cock bunched his balls up in a tasty way.  So I went and did this pic, instead showing off two nicely displayed sets of male bits :)  Also, I made the water dragon's cock ribbed (imagine stacking the glans of a human penis on top of eachother a couple times, and that's basically what it is), more fun for both parties :)
