I didn't see this in your rec list, but do you have any parseltongue fics?
I have some :)
Secrets by Vorabiza (411k)
Beginning with Draco’s unexpected arrival at the Dursleys, Harry’s summer after sixth year becomes filled with activity and many secrets. As his summer progresses, Harry generates several unexpected allies as he finds himself actively becoming the leader of the Light side.
Potter’s Parselprostate (and the Chamber of Secrets) by @dictacontrion (17k)
Hogwarts’ future depends on Malfoy’s texts. Too bad the key is up Potter’s arse.
Coffee, Cakes and Doorknob Snakes by Omi_Ohmy (41k)
Harry’s house is trying to kill him, and only one person can help him: pity it’s Draco Malfoy
Corruptela Vox by Constant Vigilance (5k)
Draco’s kink is revealed.
The Sounds of Sibilance by create_serenity (6k)
Draco really wished he’d never suggested buying that bloody snake!
WildSide by enchanted_jae (19k)
Harry has developed an affinity for the club scene, but it’s not nearly as powerful as his attraction to Draco Malfoy’s mysterious tattoo.
Slithering by astolat (27k)
Draco found the nest down in the Manor’s cellars, while he was clearing them out.
Who I Really Am by @agentmoppet (8k)
Draco seems to have changed since the war, and is insisting on making amends for his actions. But he’s still a Malfoy, for heaven’s sake… And, it would seem, a Malfoy with a certain kink…
Checking out the Opposition by birdsofshore (6k)
Harry and Draco seem quite wound up after their latest game of Quidditch.
A Sound Like Serpents Singing by Lomonaaeren (12k)
When Draco Malfoy wants a magical snake for his son, he turns to the best in the magical world—serpent-breeder Harry Potter. Harry, who thought that all his past grudges had been settled, is startled by the way he responds to Malfoy. For many reasons. [Sequel Hyperion]
Let Me Be Your Voice by Queenie_Mab (47k)
As the hero of the revolution, Harry leads the wizarding world in its efforts to rebuild; but first old wounds must be tended, rifts caused by hate mended, and his history with Draco Malfoy seems like the perfect place to start.
Say the Magic Word by NurseDarry (6k)
Salazar Slytherin takes a holiday and Draco gets locked out of the House.
Confession Is Good For the Soul by Anna Fugazzi (28k)
Confession may be good for the soul, but Draco learns that it’s also hell on the nerves and libido.
In Plain Sight by mijan (7k)
Draco has taken up sanctuary in a disused section of Twelve Grimmauld Place. Nobody knows he’s there except Harry, so to keep him from going insane, Harry lends Draco his Invisibility Cloak. Draco finds a new hobby… and discovers a kink he didn’t know he had.
The Race by SilentAuror (16k)
It’s a race against time and an old enemy, and one that will take Harry on an eerie journey.
Arctic Fox by scrtkpr (28k)
“Isn’t that Draco Malfoy? He keeps looking at you, Harry.”
Bilingual by Becka (3k)
Draco wants something only Harry can give him.
Was It Something I Said? and sequel Pillow Talk by nursedarry (2k + 0.8k)
Hot and heavy parseltongue action. Draco has a kink he had no idea about until he hears Harry speak in parseltongue, and Harry finds out! I would LOVE a dash of bondage (as in let’s-tie-Draco-up-and-taunt-him-until-he-combusts!)
Language of Love by beren (1k)
Harry and Draco try a little experiment with Parseltongue.
Parselsmut Interruptus by bryoneybrynn (1k)
But somewhere along the way annoyance had turned into something else and a careful dance had begun, one that had taken forever, but had finally ended up here, in Draco’s flat, with Harry Potter spread out in all his glory on Draco’s bed.
Tease by Viridescence (3k)
Harry teaches Draco a lesson. Whether it serves as punishment is another matter entirely.