Here's a list of fics I really like. Marked with a star are especially impotant ones you should definetely read.

Axis Powers Hetalia

• American in America (USA/UK)
• Ask me Anything (USA/UK)
• Cold December Night (USA/UK)
• Cuckoo in the Nest (USA/UK)
• Honey, I Lost My Soulmate (USA/UK)
• We'll Meet Again (USA/UK) ★
• Wrong Number (Explicit) (USA/UK)

Bishoujo Senshi Sailor Moon

• Monumental (Seiya/Usagi)
• Cosmic Affinity (Seiya/Usagi)

Boku no Hero Academia

• 2AM Knows All Secrets (Kirishima/Bakugo)
• avian (Kirishima/Bakugo)
• Charmed (Enji/Hawks)
• The Beauty of a Beast (Kirishima/Bakugo) ★
• The Winnter Takes it All (Enji/Hawks) ★
• Slow it down (go easy on me) (Kirishima/Bakugo)
• Tonight, we're the Sea (Kirishima/Bakugo) ★

Bungou Stray Dogs

• A Kiss On Your Crown (Dazai/Atsushi)
• A Soft Place to Fall (Dazai/Atsushi)
• A Sprinkling of Pixie Dust (Dazai/Atsushi)
• Hazel (Dazai/Atsushi)
• It Takes a Heap of Living (Dazai/Atsushi)
• Kaleidoscopic (Dazai/Atsushi)
• Kiss Me Like The World Is Gonna Disappear (Dazai/Atsushi)
• More Than a Spell or a Chant (Dazai/Atsushi) ★
• Neko (Explicit) (Dazai/Atsushi)
• Noises (Dazai/Atsushi)
• Serene Examples of Sincerity (Dazai/Atsushi)
• The Path Lost Children Take (Dazai/Atsushi)
• Thinking Too Much (Explicit) (Dazai/Atsushi)
• What's in a name? (Chuuya/Akutagawa)

Danganronpa

• Equivalence (Komaeda/Hinata)
• Long Road to North (Komaeda/Hinata) ★
• The Weeping Wisteria (Komaeda/Hinata)

Devilman

• Come Home With Me (Explicit) (Ryo/Akira)
• Does He Know Who You Are? (Ryo/Akira)
• Nothing More (Explicit) (Ryo/Akira)
• Teenage Love (It's Complicated) (Ryo/Akira, Miki/Miki)

Fate/Series

• 5 Mundane Rumours about Professor Velvet (And the truth of them) (Iskandar/Waver)
• shāh māt (Waver/Iskandar)

Fire Emblem Awakening

• A Will and A Way (Explicit) (Chrom/Robin(F))

Fragile Dreams

• Four Seasons (Crow/Seto)

Gekkan Shoujo Nozaki-kun

• Adventures in Late Night Texting (Mayu/Mikoshiba) ★
• Embarrassing Confessions (Mayu/Mikoshiba)

Genshin Impact

• [More Espresso, Less Depresso] (Childe/Zhongli)

Homestuck

• The Finer Details of Gay Cluckbeast (John/Dave)

Hunter x Hunter

• Strong Hearts (Leorio/Kurapika, Gon/Killua)

JoJo's Bizarre Adventure

• Always Been a Storm (Caesar/Joseph)
• Flavor of the Week (Caesar/Joseph)
• gold crocodiles, they snap their teeth on your cigarette (Caesar/Joseph)
• JoJo's Bizarre Engagement (Caesar/Joseph) ★
• Kiss You (Caesar/Joseph)
• Let the Good Times Roll (Jotaro/Kakyoin, Avdol/Polnareff)
• Make Sure That We're Watertight (Caesar/Joseph) ★
• My Charger Only Works At An Angle (Explicit) (Caesar/Joseph)
• See You Again (Caesar/Joseph)
• The Only Exception (Caesar/Joseph)
• We Could Build a Home (Caesar/Joseph)
• We Might Be Dead By Tomorrow (Caesar/Joseph, Jotaro/Kakyoin)
• Yeah, I Got It Bad (Explicit) (Caesar/Joseph)

Kobayashi-san Chi no Maid Dragon

• Baby, we've got it made (Kobayashi/Tohru)

Love Live! Sunshine!!

• Of Flying, of Falling (Chika/Riko) ★

Mob Psycho 100

• Date (Teru/Mob)

Noragami

• Fourteen (Yato/Yukine) ★
• Giving Life (Yato/Yukine)
• Let him pour through your hands like a stream of light (Yato/Yukine)
• Untitled (Yato/Yukine)

Prince of Tennis

• Kismet (Kirihara/Kamio)
• Life Goes On (Kirihara/Kamio)

Persona 2

• Last Test and Proof (Tatsuya/Jun) ★
• Smiling Lonely Faces (Tatsuya/Jun)
• White Noise (Explicit) (Tatsuya/Jun)

Persona 3

• Held in the arms of your words (Ryoji/Minato)
• Telling Eyes (Ryoji/Minato)

Persona 4

• Action and Reaction (Souji/Yosuke)
• Apartment 209 (Explicit) (Souji/Yosuke)
• Broken/Strong (Souji/Yosuke)
• But Still is True (Explicit) (Yukiko/Chie)
• Every Mistake (Souji/Yosuke) ★
• Every Moment's Enough (Souji/Yosuke)
• Groundhog Day Effect (Explicit) (Souji/Yosuke)
• Homecoming (Souji/Yosuke)
• Nebulous (Souji/Yosuke)
• No Beginning, No End (Souji/Yosuke) ★
• Nodus Tollen (Souji/Yosuke)
• Out of Service (Souji/Yosuke) ★
• Purple Hearts (Souji/Yosuke)
• Straight Guy Worries He's Being Homophobic to Gay Roommate, Realizes He's Fallen in Love with Him (Souji/Yosuke)
• Ten Steps (Souji/Yosuke)
• The day Dojima decided Souji needed a car (Souji/Yosuke)
• There's No Need to Do It Alone (Souji/Yosuke)
• Turn Away (Souji/Yosuke)
• Wrong Numbers and Coffee (Souji/Yosuke)

Persona 5

• Complimentary (Akira/Yusuke)
• Easing the Pain (Explicit) (Haru/Makoto)

Real Account

• Vice (Explicit) (Mizuki/Yuuma)

RWBY

• The Foxtrot (Weiss/Ruby)

Tales of Graces

• A little different from your average fairy tale (Richard/Asbel)
• Lessons on Gentlemanly Behavior (Richard/Asbel)

Tales of Zestiria

• Drinking with Rose (Sorey/Mikleo)
• Method Acting (Sorey/Mikleo) ★
• Our Historia (Sorey/Mikleo)
• Servant of Love (Sorey/Mikleo)