I know Peter is not your favorite whumpee, but more fic dealing with his imprisonment, whether it's during that time, or just him and Neal talking/dealing with it would be good for the imprisonment square.

Shipwrecked would be so much fun! Future fic, with Neal off-anklet? Everyone (or whoever) is celebrating his release on June's yacht, and A Storm Happens. Shipwrecking ensues, and we end up with a Blue Lagoon situation that involves people being half-naked and having sex in between trying to be rescued. Yay? Yay! Or something. :p