Pairing Meme, Cont'd

There's six pairings that Ari wasn't able to (or at least hasn't yet) guess in last week's meme. They're from two book fandoms, a comics fandom, a TV fandom, a theatre fandom, and a movie fandom, although I can think of at least one pairing which arguably fits into more than one of those categories. New parts of clues are underlined; the parts of the old clues I took out to still make 15 words are in strikethrough. Two are 0T3's/rival OTP's (e.g., Wesley/Fred/Lilah).

3. Sentences flow together and genome shared, as do selves in bodies stripped bare to red-headed clones travel  through infinite times, possibilities. Hook shop? Got myth?> [Robert A. Heinlein's World-as-Myth -- Lapus Lazuli Long/Lorelai Lee Long -- guessed by wisdomeagle]

5. Complements, conqueror and nurturer Talk about smart kids: all the world, save one brother, falls at their feet, via computer. [Ender's Game -- Peter/Valentine -- guessed by seriousfic]

10. A madwoman, irresistible; and her caretaker, now awake: the future which manipulates them underestimates their love. [The 4400 -- Tess/Kevin -- guessed by wisdomeagle]

12. New canon (boo! invented in his mind) wrecks old OTP, gives new one. No need for Ursine ingestion? No thanks, though. [X-Men Movieverse -- Bobby/Rogue/Kitty -- guessed by wisdomeagle]

13. Cooler than Tryst with cat no rival for red-haired true love beauty--'til David's star arrives in school Queens? [Ultimate Marvel -- Peter/MJ/Kitty -- guessed by wisdomeagle]

14. Age Epoch too young for chaos theory, girl pupil too young to dance waltz; her absence breeds madness.

[Arcadia -- Thomasina/Septimus -- guessed (with major clue-giving from me) by wisdomeagle]