These books feature Spock/Saavik as part of their main plot lines.

Vulcan's Soul Trilogy Book Three: Epiphany by Josepha Sherman and Susan Shwartz

As the hidden truth about the Romulans' early history is revealed at last, its implications for the future play out as Spock and his allies reach across a gulf of both time and space in an attempt to bridge the gap that separates the longscattered offshoots of the Vulcan people. And though the reunification he hopes to achieve will come at a terrible cost, failure could mean centuries of sorrow and chaos for untold millions.... For the legions of readers who enjoyed the first two books in the series, as well as the authors' previous bestsellers, VULCAN'S FORGE and VULCAN'S HEART, EPIPHANY will not disappoint eager fans of the VULCAN'S SOUL trilogy.

Vulcan's Soul Trilogy Book Two: Exiles by Josepha Sherman and Susan Shwartz

Tensions remain high as the United Federation of Planets, the Klingon Empire, and the Romulan Star Empire attempt to maintain their fragile post-Dominion War peace in the wake of the brutal attack by the mysterious Watraii that ended with the loss of Admiral Pavel Chekov. When Admiral Uhura receives intelligence regarding a Watraii base that may contain more than one surprise, she sends Ambassador Spock, Captain Saavik, Ruanek, Captain Montgomery Scott, and Lieutenant Commander Data on a covert mission to learn its secrets....
But the true secrets of the Watraii have their basis millennia in the past. In the time of Surak, Vulcans were at a crossroads, on the cusp of either embracing logic or succumbing to emotion and destroying themselves. With Surak's blessing, a group of Vulcans left their turbulent homeworld to find their destiny among the stars -- but the stars prove themselves even more unforgiving than the sands of Vulcan's deserts, as Karatek, the reluctant leader of the exiles, must struggle to hold the community together.

Vulcan's Soul Trilogy Book One: Exodus by Josepha Sherman and Susan Shwartz

One year after the end of the Dominion War, the Romulan Star Empire comes under attack by a mysterious and alarmingly powerful enemy calling itself the Watraii, a species with a long-standing vendetta against the Romulans. Yet though they remain tenuously allied, the Federation, the Romulans and the Klingons are unready to become embroiled in another sustained conflict, forcing Ambassador Spock, Admiral Uhura, Admiral Chekov, Captain Saavik, and some unexpected allies to defy their governments in order to meet the new threat head-on. But the first blood drawn may prove to be among the dearest of all.

Vulcan's Heart by Josepha Sherman and Susan Shwartz

Spock's and Saavik's bonding is attended by such guests as Dr. McCoy and a Lt. Jean-Luc Picard. But plans for the pair's union are thrown off course when Spock received a communication that lured him into the heart of the Romulan Empire. Spock answers the call, but the chief of Starfleet Intelligence, Captain Uhura, detects his departure and sends Spock's betrothed, Commander Saavik, after him as backup. The Vulcans plunge into a hotbed of deadly intrigue, in the middle of which they develop pon farr, the Vulcan mating frenzy that can be fatal if not consummated. Still, both fight it and risk their lives to save the Empire and the Federation before they can think of being together.
I found this review of Vulcan's Heart, but what really engrossed me was the person's viewpoint from her own life and experiences that made her delve into the Spock and Saavik relationship. I hope you enjoy it too.

Just A Little Training Cruise in "Enterprise Logs" by A.C. Crispin

Saavik and especially Spock first consider the other as a possible bondmate.

Blood Sacrifice in "Tales of the Dominion War" by Josepha Sherman and Susan Shwartz

Set on Romulus during the events of DS9 "In the Pale Moonlight", the story deals with the machinations behind Romulus' entry into the war on the Federation side. Ruanek, of "Vulcan's Forge" and "Vulcan's Heart", is also a major character in the story.

Out of the Frying Pan in "No Limits (New Frontier anthology)" by Susan Shwartz

The adventure with Soleta and Ambassador Spock set after their first meeting in NF #1.

First Law of Metaphysics in "Strange New Worlds II" by Michael S. Poteet

After getting a note from Saavik, Spock travels to Vulcan thinking they may have a daughter conceived on Genesis.

These books feature Saavik with Spock or by herself.

Infinity in "The Lives of Dax" by Susan Wright

Because of her exceptional expertise in warp navigation, Cadet Saavik is assigned to the Warp Ten project with Torias Dax.

Pandora Principle by Carolyn Clowes

Captain Kirk and the Enterprise crew bring to Earth for examination a disabled Romulan Bird of Prey. But the Bird carries a deadly cargo. The Federation's survival depends on Spock and his protege Saavik. The two must return to the planet of Saavik's birth to discover the Romulan's secret and its solution.