During this movie, it would have been fantastic to have a sub plot where Padme and Obi-wan became close (as good friends, Obi-Wan would never put a move on her), but Anakin is insanely jealous (you know, the whole "passion" thing that has been haunting him since episode 1). He grows more and more suspicious of Obi-wan, but can't confront him because A) he knows it would sound silly, and B) he might give away his secret that he's married (i.e. "Stay away from my wife!...oops.")
When Obi-Wan comes to tell Padme that he must do away with Anakin, she erupts in horror (not the, "you're going to kill him aren't you? Dude, that sucks." line she delivered) and passionatly begs him to spare Anakin's life, if not for him but for his unborn child. Tears are flowing down her cheeks as she clutches Obi-Wan's robes (reminecent of an earlier scene in my mind where Anakin walk in on Obi-Wan hugging and comforting her) and begs him not to kill her husband. Obi-Wan understands, but he must still find him and confront him. She turns and runs from the balcony (as much as her pregnant body will allow) and Obi-Wan slowly turns and heads too his ship.
Now this is where my ending comes in:
Anakin is on Mustafar and Padme lands and rushes up to him. They kiss and she tells him that Obi-wan is looking for him to kill him. They have to run away, ("All I want is your love" lines and such), and that is when Anakin see's Obi-Wan coming from the ship. Similar dialogue, "You brough him her to kill me!" Anakin force-chokes Padme and lifts her off the ground using the force. Her performance is much more realistic and she can't even make a breath sound he is holding her so tight. Obi-Wan yells at him to let her go, and Anakin - sill in pure anger - uses the force and slams her against the far wall, she tumbles and falls still.
...battle sequence....blah blah blah (could be better, but whatever)
Enter asteroid medical facility. A medical droid (looking similar to what was used in ESB) tells the gang what has happend.
Droid: "We've done everything that we can, but we're loosing her."
Obi-Wan: "She's dying."
Droid: "Yes. The damage is severe. She's bleeding internally, and were doing everything that we can, but she's giving up. We'll have to something quickly to save the babies before we loose their mother."
Obi-Wan: "Babies?"
Droid: "She's caring twins."
Due to her trauma, Padme has gone into premature labor and Obi-Wan enters the med lab. Waking, Padme's eyes fluter and see's Obi-Wan. He takes her hand and she painfully wisper's his name. "Obi-wan..."
"Shhhh. It's okay Padme. You're gonna be fine. You're doing great." She closes her eyes and lets out a pained yell as she has a contraction.
Droid: "Please push senator. You are almost there. I need you to push." She lets out another yell and the droid presents a girl.
Obi-Wan: "It's a girl!" He takes the bloody, rapped baby to Padme's side and she extends her hand. Gently she brushes the baby's cheek with the back of her hand and says "Leia..." She yells out again and the second baby is born.
Droid: "A boy, your highness." She looks down at her feet and sees the droid holding her baby. "Luke..." she says weakly and falls back on her pillow, exausted. Obi-Wan, still cradeling baby Leia leans in close to her. She extends her arm and touches his forarm above Leia. "Obi-Wan....there...there is still good in him." Her eyes start to close and her hand starts to slip down. "Don't give up, Padme!" Obi-Wan encourages "Don't give up!" But it is too late. Her hand slips past her open eyed daughter and falls limp by the side of the bed.
Something like that. Wow, that was very theraputic to write. I like that version.