Read a couple of stories by Anna Amuse
, liked the Homerun trilogy and the Absolute Horizon. Mostly about Kirk and Spock, just friendship, very touchy, dramatic, unbelievable turn of events, lot of action, suitable for anyone 13+.
I highly recommend
She's excellent, and I'm only a little biased as her editor.
A better place to read Absolute Horizon
is Ad Astra, though; she also has a few other stories on there that she may or may not have on FF.N.