Your typical angsty relationship story with Kirk and Spock coming together at the end to bond, with the challenge being no sex takes part up to and including the bonding (no accidental bond!). Kirk always goes to sex first. Can this love transcend sex for that key moment? Can the bond itself be enough to fulfill his soul and take his breath away?
Of course the happy couple will likely have TONS of sex in their future (or even in the epilogue), but it would be interesting to see a 'first time' style story that doesn't rely on lust to bring them together or orgasm to cement a bond.