Finito.

Assets/Resources/TransparencyBitch.shader

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+Shader "Custom/TransparencyBitch" {
+	Properties { 
+        _MainTex ("Base (RGB)", 2D) = "white" {}
+        _BlendTex ("Overlay", 2D) = "white" {}
+        _Ratio ("Ratio", Float) = 0
+    }
+
+	CGINCLUDE
+
+	#include "UnityCG.cginc"
+
+	uniform sampler2D _MainTex;
+	uniform sampler2D _BlendTex;
+    uniform float _Ratio;
+
+	struct v2f {
+		float4 pos : SV_POSITION;
+		float2 tex : TEXCOORD0;
+	};
+
+	v2f vert(appdata_base v) {
+		v2f o;
+		o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
+		o.tex = v.texcoord;
+		return o;
+	}
+
+	float4 frag(v2f i) : COLOR {
+		float4 color = tex2D(_MainTex, i.tex);
+        float4 color2 = tex2D(_BlendTex, i.tex);
+		return float4(color.rgb * (1 - _Ratio) + color2.rgb * (_Ratio), 1);
+	}
+
+	ENDCG
+
+	SubShader {
+		Pass {
+			ZTest Always Cull Off ZWrite Off
+			Fog { Mode Off }
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			ENDCG
+		}
+	}
+}