Chris i think its not a good idea to write pen pals on the same block or even the same facility but this might be different since you were writing both beforehand. Are these male or female inmates? I think under the circumstances you might need to decide based on how close you are with your pals or how long you have been writing. I agree with Skye though its always best just to be upfront about it as they will find out about each other eventually and then might be angry if they were not told. It also depends on the nature of your relationships with them. Is it just friends or romantic interests? That might make a world of differance.

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"Thats it then, they will go on double, secret, probation..."