The following is based very loosely upon some true events. There will likely be more if I can find time to write it and if people find it interesting. (please vote!)
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We had pulled in early in the morning and I slept late into the morning. After waking up, I headed to the computer downstairs to check my email. Sure enough, an email from Mistress was waiting for me, with a few instructions.
"Slave,
I hope your drive was good and that you've caught up on your sleep. Since you're in such a big town, I'm sure that you can find yourself an adult shop to go to tonight. I'll expect you to have completed the following task by midnight. If you don't, you'll be seeing your dick locked up for the next two weeks, so don't fuck this one up.
Go to the adult store and go immediately to wherever the toys are. You are instructed to find a dildo that you think is the same size as your own cock. You can buy any color and any material you want, but it should be as close to the size of your dick as possible. You are not permitted to view and of the magazines or videos. If there is a back room for videos, you are prohibited from entering it. Get the fake cock off the wall and take it to the check out.
If the clerk is friendly and offers ideas as to "Well this should be fun for her" you will be sure to let them know that this dildo is for _your_ ass. A line like "actually, she intends to slip this dildo into my ass" is suitable. Should the clerk continue to converse with you, you will be sure to let him or her know that your ass is mine for fucking, that your dick is not worthy of me and that you're prohibited from cumming without my permission. Remember slut, you're mine and anyone who asks about it better damn well know it. If he hits on you and wants you to suck him off, you'll politely decline, citing this email as your instructions.
Buy me the dildo, save me the receipt and head back to the house and I'll give you more instructions then."
My cock rose with her instructions and I began to plan how I could sneak out of the house, find an adult store and sneak and 8" cock into the house after I bought it.
Through the errands of the day, I found that there was an adult store only two or three blocks from my mother-in-laws house. This would make it easy to accomplish my orders. I'd take a walk and get into the adult store and buy things then.
I went through my day, wondering what Mistress would plan for me to do that evening. Family was visited, lunch eaten, then dinner. The kids went to bed and I decided to take my walk. I went over to the adult shop and walked in. Against Mistress' wishes I browsed the DVD's and the magazines, concentrating on the BDSM material. I finally wandered back to the toy section which had been right next to the door on the way in. I started looking around the wall for appropriate sized cocks. I settled on one, having taken several down from the wall to see what they looked like in my hands. I settled on a red jelly cock that had itself labeled as 8" long, the size at which I had last been measured.
Walking to the counter with fake cock, the man behind the counter got up from his chinese food that had been delivered to him since I arrived in the shop. "This ought to be a fun one to play with then" he smiled at me.
"Yes, I think Mistress will enjoy sliding it into my ass."