I'm not sure when this will air but I wrote a full length story for this.
Valaeron Modern Academia AU
basically the story starts when Valarr is nineteen fresh out of secondary school his mom just passed he's reunited with his cousin's family. At that point he's not very close with the maekarlings anymore since their mother passing where he saw Daeron actually reaching out for him and ask if Valarr is okay about his mother's passing. Valarr thinks it's just as it is, his mom has been sick and he saw how Baelor was also ready to let his wife go so he's calm about it (he's repressed af) Still he's never seen his cousin so affectionate towards him and he thinks Daeron is back to his old caring self.
Then they have this gala bc Baelor is running for prime minister and stuff. Daeron was brought there by Maekar to do the band while Valarr is there as his father's succession. Valarr dgaf, he's polite, but he keeps looking over to see his cousin. He saw Daeron went off to the back of the service area blending in perfectly with the caterer and when Valarr attempted to do the same he was halted. he stuck up like a sore thumb. so he went through the hall to find the service corridor and sneak his way out to the loading bay where he found Daeron flirting with the cook. He's repulsed, confused, jealous and interrupted them trying to dig about Daeron's habit of always knowing the b workers (derogatory).
Fast forward they met again at freshmen mixer, they have one of those themed party. Daeron asked him what's his type so he can fix Valarr up with someone to which he replies; A girl, who’s kind, and smart– preferably honored. Daeron told him that's a job resume not a type. so Valarr gave up and say tall and blonde, and Daeron snorted so Valarr asked him what's his type and Daeron says striking eyes and great neck. Both not realizing they're describing each other.
First semester went by, Valarr tries to find reason to seek out Daeron in his dorm and just generally stalk him when he has the time, they went out to drinks, get into bar fight. Valarr didn't notice that Daeron has been using he just thought, wow! my cousin is so fun and so wild and so sexy, this is how college life should be!
Until it was the semester break where they both head to summerhall together. Daeron planned on taking a longer route without their driver. so Valarr asked to come with him agreeing not to tell their parents.
They spent the whole road trip talking about why they drifted apart and that it had hurt Valarr when he didn't hear from Daeron. and Daeron is like, wait you didn't know I was on rehab? and Valarr never pieced it together. So Daeron just talked about his mother passing and how all of his siblings have turned to him to grief because Maekar couldn't take it. He actually got better and applied for college, and he mentioned how strange that he never heard back from Juilliard and instead he went to Oxford.
When they got back Daeron turned cold again. Somehow Maekar knows Daeron has been using (by now Valarr still haven't realize that) and beat the shit out of Daeron. + Valarr heard Maekar make an offhanded comments about 'thank god I threw away Juilliard' or smth like that 'I can't let you out of this country if that's how you're going to behave'. Valarr inquires about that to Baelor but he just dismissed it said it's not their business. On their family outing day he talked about moving in together for the next semester. Maekar thinks it's outrageous but he allows it while Baelor thinks somehow Valarr turned out to be exactly like him, obsessive and insecure by keeping someone he loves at arms length but Baelor knew better than to say it out loud.
They got a flat nearer to the city centre. Valarr moved Daeron's piano from summerhall to their flat after his cousin mentioned that he misses playing it.
Daeron finally caught up to Valarr's grand gesture. Since Valarr won't admit to it Daeron decided to make the first move. They fuck about it first on the piano, then on the couch then casually everywhere where they can be together. Valarr also found out about the drugs, it's hard to hide them when they live together. When he confronted Daeron about it his cousin said that it's just self medication, Daeron promised that he won't do anything stupid and sickeningly enough Valarr likes taking care of Daeron when he's out of his mind. When Daeron's a mess and weeping on the floor he gets to be the first person to brought him back to life again. During those times when Daeron is out of it he became docile and needy enough to want Valarr.
Until one day Daeron didn't come home from class, Valarr hadn't paid much attention to it because it's been a busy week for them. Valarr got a call in the middle of the night to hear from someone else that Daeron od at a party. Valarr kept it a secret from everyone instead of calling their family. His cousin was in a bad shape and there was no way of helping him. Valarr knew if Maekar heard about this he would be locked away and Valarr cant have that. but he cant have scandal either bc his dad was running for prime minister.
yadayada Valarr is a coward so he would never admit to ever indulged Daeron in anyway and somehow Maekar believes, while Baelor has his suspicion. Daeron is sent away again but this time no one can visit him until the program is over because he nearly died and if he ever relapsed it will be over for him.
Valarr went back to his usual life, pretending like nothing ever happened because he hasn't seen Daeron again since he went to rehab. and when they do meet again Daeron just told him how much of a coward he is and that he's bound to be whatever it is that he hates so much about himself.
bonus: After Daeron's clean he got out of the country, went to play for some gig and actually made a name for himself, become an accomplish composer for movie scores. While Valarr stayed in UK and continues the family legacy while still searching for some semblance of Daeron in people he meets, trying to replicate their intimacy but failed miserably because he knows that no one would know him better than Daeron ever did.