diff --git a/server/src/systems/__tests__/socialSystem.test.ts b/server/src/systems/__tests__/socialSystem.test.ts
index 887eced..a2d4f89 100644
--- a/server/src/systems/__tests__/socialSystem.test.ts
+++ b/server/src/systems/__tests__/socialSystem.test.ts
@@ -341,6 +341,37 @@ describe('socialSystem', () => {
       expect(saAfter.globalCooldown).toBe(40);
     });
 
+    it('drifts sociability and empathy on positive social outcome', () => {
+      const world = new World();
+      const a = createNPC(world, 5, 5);
+      const b = createNPC(world, 8, 5);
+      addStats(world, a, { sociability: 10.0, empathy: 10.0 });
+      addStats(world, b);
+      const sa = world.getComponent<SocialState>(a, 'socialState')!;
+      const sb = world.getComponent<SocialState>(b, 'socialState')!;
+      sa.phase = 'emoting'; sa.partnerId = b; sa.phaseTimer = 1; sa.outcome = 'positive';
+      sb.phase = 'emoting'; sb.partnerId = a; sb.phaseTimer = 1; sb.outcome = 'positive';
+      socialSystem(world);
+      const stats = world.getComponent<Stats>(a, 'stats')!;
+      expect(stats.sociability).toBeCloseTo(10.05);
+      expect(stats.empathy).toBeCloseTo(10.05);
+    });
+
+    it('drifts temperament on negative social outcome', () => {
+      const world = new World();
+      const a = createNPC(world, 5, 5);
+      const b = createNPC(world, 8, 5);
+      addStats(world, a, { temperament: 10.0 });
+      addStats(world, b);
+      const sa = world.getComponent<SocialState>(a, 'socialState')!;
+      const sb = world.getComponent<SocialState>(b, 'socialState')!;
+      sa.phase = 'emoting'; sa.partnerId = b; sa.phaseTimer = 1; sa.outcome = 'negative';
+      sb.phase = 'emoting'; sb.partnerId = a; sb.phaseTimer = 1; sb.outcome = 'negative';
+      socialSystem(world);
+      const stats = world.getComponent<Stats>(a, 'stats')!;
+      expect(stats.temperament).toBeCloseTo(10.02);
+    });
+
     it('high empathy biases positive outcome', () => {
       const world = new World();
       let positiveCount = 0;
diff --git a/server/src/systems/socialSystem.ts b/server/src/systems/socialSystem.ts
index 9aefa53..0deff58 100644
--- a/server/src/systems/socialSystem.ts
+++ b/server/src/systems/socialSystem.ts
@@ -3,6 +3,7 @@ import {
   SOCIAL_GLOBAL_COOLDOWN, SOCIAL_PAIR_COOLDOWN,
   HUNGER_THRESHOLD, ENERGY_THRESHOLD, Direction,
   type SocialState, type Position, type Movement, type NPCBrain, type Needs, type EntityId,
+  type Stats,
 } from '@dflike/shared';
 import type { World } from '../ecs/World.js';
 import { getEffectiveStat } from './statHelpers.js';
@@ -102,14 +103,36 @@ export function socialSystem(world: World): void {
         const socA = getEffectiveStat(world, e, 'sociability');
         social.globalCooldown = Math.round(SOCIAL_GLOBAL_COOLDOWN * (1 - (socA - 10) * 0.04));
         social.pairCooldowns.set(partnerId!, SOCIAL_PAIR_COOLDOWN);
+
+        const socB = getEffectiveStat(world, partnerId!, 'sociability');
+        partnerSocial.globalCooldown = Math.round(SOCIAL_GLOBAL_COOLDOWN * (1 - (socB - 10) * 0.04));
+        partnerSocial.pairCooldowns.set(e, SOCIAL_PAIR_COOLDOWN);
+
+        // Baseline stat drift
+        const statsA = world.getComponent<Stats>(e, 'stats');
+        if (statsA) {
+          if (social.outcome === 'positive') {
+            statsA.sociability = Math.min(18, statsA.sociability + 0.05);
+            statsA.empathy = Math.min(18, statsA.empathy + 0.05);
+          } else {
+            statsA.temperament = Math.min(18, statsA.temperament + 0.02);
+          }
+        }
+        const statsB = world.getComponent<Stats>(partnerId!, 'stats');
+        if (statsB) {
+          if (partnerSocial.outcome === 'positive') {
+            statsB.sociability = Math.min(18, statsB.sociability + 0.05);
+            statsB.empathy = Math.min(18, statsB.empathy + 0.05);
+          } else {
+            statsB.temperament = Math.min(18, statsB.temperament + 0.02);
+          }
+        }
+
         social.phase = 'none';
         social.partnerId = null;
         social.phaseTimer = 0;
         social.outcome = null;
 
-        const socB = getEffectiveStat(world, partnerId!, 'sociability');
-        partnerSocial.globalCooldown = Math.round(SOCIAL_GLOBAL_COOLDOWN * (1 - (socB - 10) * 0.04));
-        partnerSocial.pairCooldowns.set(e, SOCIAL_PAIR_COOLDOWN);
         partnerSocial.phase = 'none';
         partnerSocial.partnerId = null;
         partnerSocial.phaseTimer = 0;