Big Duel isn't supposed to be all that long. Like five pages or something? Misty's Revenge is, as you'd expect, a pokemon comic. All Ash's other girls have grown up except Misty. They invite her to a get-together at a hot spring. She initially refuses but is lured in by the idea of seeing Ash again, before realising what she's agreed to. Apparently last time, they treated her with a mix of "Aww so cute," and "Har har she's flat." She wishes she could get back at them and a certain mysterious being hears her and grants her wish. A week later, she's by far the biggest. She heads to the meetup, asserts her dominance over the other girls by a little 'playtime' before effectively kidnapping Ash for some more fun, made even better by the fact that she's not done and starts growing again halfway through. Honestly, I think it's one of his best works yet. If he could output those faster, he'd make money hand over fist - totally worth it.
Last I heard, he had plans to do a sequel to Wish Upon A Star, as soon as he could nail down his writer. One idea that got floated was including his little succubus character too.