I have no idea how someone comes up with a game concept like this one, but it's wild and brilliant! The noises, squishy walls and fully animated cock motions are what truly make it cartoonishly convincing. The dialogue adds a good bit of flavor and the music sets the atmosphere.
There are lots of clever stages that make good use of the game's mechanics. The mouse controls demand a bit too much motion to get moving, but the keyboard controls are just right. I struggled with the mouse for a while thinking that the controls are locked-in after the start menu. I'm not sure if having the option to switch between the two is strictly necessary, you could just have mouse and keyboard active since the shortcut to bring up the menu isn't something that players will intuitively discover. The undo key is also not fully obvious.
A different developer would make a quick joke game after getting this idea, but you have carefully polished it to perfection. Most admirably done!