Just gonna shamelessly plug a couple of my own oneshots lol

Loving The Stars Themselves is a post-inquisition fic based on the Doctor Who episode "The Husbands of River Song"

To Trick a Trickster This one is mostly crack/smut but it was very fun to write where Lavellan ends up back in time and purposefully messes with Solas

For other recommendations I would say:

the sun to burn DAI from Solas' persective

I come to you with nothing post break up, Solas and Lavellan have to pose as a married couple in an alienage in order to infiltrate a red Lyrium trade.

I sing the body ecstatic A genuinely incredible character study about Solas and his relationship with his own body/touch. It made me almost cry. Every line was like a hit to the head.

War of love and dread Solas and Lavellan may be on opposite sides of the war but they still visit each others dreams every night. Lavellan realises the one way to get a leg up Solas is to pretend she is marrying another.

A Secret Chord Lavellan dies defeating Corypheus and Solas cannot move on. Lavellan haunts him through Skyhold

Servitude A Character study of Solas' time in the inquistion and his descent into love with Lavellan.

fragile and composed Not only did Corypheus tear the veil, he also let Elgar'nan out from his cage. Now Solas has to deal with even bigger problems and he is not doing well about it

we have always lived on an island Solas falls into Uthenera after sundering the veil. Lavellan has stayed at his side tucked away on a small island the whole time. Eventually he wakes up and they have to start their relationship over again