Eh, a little idea about Zekrom, Reshiram and Kyurem. Like they are all three a part of the same dragon, maybe they have all three a humongous part of the dragon ? Zekrom have humongous boobs, Reshiram have humongous rear and Kyurem is obese and so have a huge belly ? And like their signature attack can have effects with each other's their pregnancy have an impact ? For exemple when one of them is impregnated all of them are, but the two not impregnated directly still are fertile so they can be impregnated too, and some make all of three even more impregnated ? And following this logic, maybe all three can have a different part of the original mind pushed but are similarly minded overall ? Like, they are all joyful, motherly and greedy but Zekrom is way more joyful, Reshiram way more motherly and Kyurem way more greedy ? I thinked joyful for Zekrom because electric type, so she's energic and all, motherly for Reshiram because the fire who make the eggs warm and have a warm personality and Kyurem greedy because she's fat and she can fuse with both others ?
And maybe have fun imaginating a fuse of all three where they stack their elements : super joyful, super motherly, super greedy, very obese, humongous boobs and ass and immobilised because way too much pregnant ? :3
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I won't go into detail, but SOME of what you've suggested, I kind of had planned anyway.
Mostly the physical side of things, Reshiram was always going to have a huge ass, but your idea to give Zekrom massive tits makes sense, the same with Kyurem getting a big belly.
That said, their personalities will be quite different from what you suggested, I could certainly have some fun with their fusions though