diff --git a/src/endWeek/saDrugs.js b/src/endWeek/saDrugs.js
index c20cba0634e6e1954b2b230b2e1e74eb83c36055..57f984b3f9ad6429e028a8a74a37a5ee5148edec 100644
--- a/src/endWeek/saDrugs.js
+++ b/src/endWeek/saDrugs.js
@@ -453,8 +453,8 @@ App.SlaveAssignment.drugs = (function() {
 					slave.geneticQuirks.macromastia = 2;
 				}
 				break;
-			case "nipple enhancers":
-				let nippleChance = ((60 + (V.injectionUpgrade * 15)) / (1 + slave.geneMods.NCS));
+			case "nipple enhancers": {
+				let nippleThreshold = ((60 - (V.injectionUpgrade * 15)) / (1 + slave.geneMods.NCS));
 				r += ` ${He} receives <span class="lime">direct injections of enhancers right into ${his} nipples,</span> causing them to swell and expand`;
 				if (slave.geneMods.NCS === 1) {
 					r += `; ${his} <span class="orange">NCS</span> reduces their effectiveness`;
@@ -462,31 +462,31 @@ App.SlaveAssignment.drugs = (function() {
 				r += `.`;
 				switch (slave.nipples) {
 					case "inverted":
-						if (jsRandom(1, 100) > nippleChance) {
+						if (jsRandom(1, 100) > nippleThreshold) {
 							r += ` <span class="lime">${His} inverted nipples swell painfully,</span> pushing their way outwards.`;
 							slave.nipples = "partially inverted";
 						}
 						break;
 					case "partially inverted":
-						if (jsRandom(1, 100) > nippleChance) {
+						if (jsRandom(1, 100) > nippleThreshold) {
 							r += ` <span class="lime">${His} nipples swell painfully,</span> exposing ${His} previously inverted nipples.`;
 							slave.nipples = jsEither(["tiny", "cute", "puffy", "huge"]);
 						}
 						break;
 					case "tiny":
-						if (jsRandom(1, 100) > nippleChance) {
+						if (jsRandom(1, 100) > nippleThreshold) {
 							r += ` <span class="lime">${His} nipples swell painfully,</span> becoming larger and cute.`;
 							slave.nipples = "cute";
 						}
 						break;
 					case "cute":
-						if (jsRandom(1, 100) > nippleChance) {
+						if (jsRandom(1, 100) > nippleThreshold) {
 							r += ` <span class="lime">${His} nipples swell painfully,</span> becoming larger and puffy.`;
 							slave.nipples = "puffy";
 						}
 						break;
 					case "puffy":
-						if (jsRandom(1, 100) > nippleChance) {
+						if (jsRandom(1, 100) > nippleThreshold) {
 							r += ` <span class="lime">${His} nipples swell painfully,</span> becoming spectacularly immense.`;
 							slave.nipples = "huge";
 						}
@@ -501,6 +501,7 @@ App.SlaveAssignment.drugs = (function() {
 						break;
 				}
 				break;
+			}
 			case "butt injections":
 			case "intensive butt injections":
 				growth = 1 + V.injectionUpgrade;