Well, whether we like or dislike a character, the end result is that we both want to see him suffer. I guess I'm just not that into sadism, suffering, etc, so I don't really think along those lines. But I'd definitely read it if you wrote something.
And in regards to Ben fucking alien girls, one of the best things about Ben 10, especially Omniverse, was the sheer amount of alien waifus, even if the Omniverse artstyle was dogshit. There's a waifu for every flavor and every fetish, so I wouldn't mind you writing about any of them. As long as Gwen remains the main girl and it doesn't involve her getting cucked in any way.