For the Fun of It [San]
pairing: san x f. reader
genre: f2l, light smut 18+
summary: San is the Birthday Boy.
wc: 1.1k
warnings: light smut like super light almost implied, alcohol use/mention, jealousy
date: July 12, 2025
Jealousy pools deep in your abdomen as you watch your best friend lean in close to a woman you don’t know. Whatever she says makes him laugh.
“Why don’t you go say hello?” Yeosang asks from beside you, his drink in his hand. He swirls the contents, allowing the ice to clink before he downs it in one swallow.
“You’d love that, wouldn’t you?” You utter as you walk away, ignoring the laugh that follows.
You don’t have time for jealousy or petty games. You’re here to network, to meet those who can make your career skyrocket.
However, a stop at the bar couldn’t hurt.
“Whiskey neat,” you tell the bartender. He nods as he turns to make your drink. You lean against the bar, wondering how soon you can head out without it being rude.
“You’re not hiding very well tonight,” Your co-worker and friend says as he stands on your right. He lifts two fingers to alert the bartender to make it 2 whiskeys.
“Why are you here?” You ask Seonghwa, who tips the bartender when your drinks are placed on the bar. You down yours as Seonghwa shrugs.
“Wanted to see you,” He sneers.
“Fuck you,” you grumble.
“Been there, done that,” Seonghwa waves you off. “When are you going to greet the guest of honor? You’re treading on rude.”
“Shut up,” You grumble as you turn your back on him. Seonghwa cackles as he finishes his drink, asking for a second as you stalk off toward the appetizers.
“Not gonna say hello?” Wooyoung asks with Yunho in tow. The two share a secret smile as you groan, turning away from them. Yunho laughs as he tugs Wooyoung to the bar.
Jongho bumps into you, apologizing profusely before you raise your hand at him. “Please, just go back to the kitchen and get ready to cut the cake. Find Hongjoong and have him collect a payment, please.”
“Yes, sir!” Jongho exclaims, face pale, before he stutters. “Yes, m-ma’am.”
You rub your temples, too annoyed to get into it with him. “Just go, and don’t tell San I’m here.”
Jongho nods as he scrambles to find Hongjoong while avoiding San. You regretted coming, but how could you miss San’s birthday?
The lights dim as you fade into the crowd. You groan when you bump into someone in your haste to hide in one of the bedrooms of the mansion.
“Sorry,” You whisper as you squeeze past the crowd as Wooyoung appears beside San, the woman he’d been chatting with long gone.
The lights go out before a spotlight appears on your best friend. He’s wearing his faux fur and grinning as Wooyoung gets the crowd excited. Your friend circle, San, and you’re the only one missing aside from…
“Now, where’s our baby girl?!” Wooyoung shouts over the crowd, and you hide behind the first person you feel beside you.
Unfortunately, it’s Mingi, and he’s smirking. He was on his way to join all your friends when you chose to hide behind him.
“I’ve got her!” Mingi announces, and you pinch his side. “Ow!”
Mingi keeps you from leaving. He uses his arm to guide you forward until you stand in front of San.
San grins as he drapes his arm around your shoulder to hold you close. The candles on the cake light up, sparkling brightly as the guests sing to him.
Despite your attempts to leave his side, San holds you tight. He smiles as his guests celebrate him, but the only person that matters is you at his side.
Once the singing ceases, the cake is taken to the kitchen to be cut up for the guests.
“Happy birthday, Sannie,” you say as you hug him, kissing his cheek. San smiles brightly as he cups your face.
“You’re the only one I really wanted here tonight. I didn’t think you’d show,” San admits, cheeks pink.
“San,” you start, but he hushes you with one long finger.
“Later, I promise. Meet me at the top of the stairs at midnight,” San says before Mingi leads him away, tearing his hand from yours.
~
You should just go home.
Surely, San would understand.
What did he wanna meet with you for anyhow?
At midnight, you reach the top of the stairs, and San is already waiting for you. He smiles gently as he cups your face and kisses you.
For a moment, you freeze but his lips are an aphrodisiac, a promise of what’s to come as he takes your hand and leads you up the rest of the stairs.
You follow him eagerly.
~
San kisses you again once you’re in private, his kisses just as delectable as you always imagined, with your hand between your legs on late nights when you needed someone else's touch but nobody ever measured up to your fantasies about San.
“Tell me what you want,” San demands, and you melt.
“It’s your birthday,” you respond, but he shushes you with one long finger.
“Not anymore. Tell me what I feel isn’t one-sided. I need to know if you feel this connection between us.”
You blush, afraid to admit to your feelings lest you read him wrong, but San is so vulnerable, his heart on the line as he studies you.
“I love you, San. Always have. Maybe I’m just a fool, but-” San’s kiss cuts you off as he presses you to the wall beside the door. Your hands grip his faux fur coat as you pull him close to kiss him.
“It was never one-sided.”
San groans as he kisses you, hiking your leg up to his waist as he presses himself to your hips, his desire evident.
“Make me yours,” you moan as he leads you to the bed. You fall onto the mattress with San between your thighs. Your hands push the faux fur coat off him and onto the floor as he hikes you up further on the bed.
“You’re mine, baby. Always have been. Didn’t think I was oblivious at the way you’d watch me, the way you’d hide away to touch yourself whilst thinking of me, of my body.” San smirks. He’s always known.
“Fuck,” you curse as he hovers above you in just his black jeans as he pins your hands over your head.
“Do you want this? Want me?” he asks in a deep tone that makes your arousal spike.
“More than anything.”
San nods as he strips you naked.
Your legs wrap around him, pulling his naked body closer.
“Please, you don’t know how long I’ve wanted this.”
“As long as I have?”
“Longer,” you admit as he kisses you while his cock sinks into you, and you arch into him, moaning his name, uncaring if the guests downstairs hear.
San is the birthday boy after all.