Shop shock

Yes sir, your wife's order is here and ready for collection.

She did leave a note with very specific instructions - here it is.

My darling husband,
Although I love your masculinity, you agreed to be my slave for this week and picking up new lingerie for me is only the beginning.
There's a matching set for you waiting at the shop - Mlle Boyard has it waiting for you. I want you to go into the changing rooms and dress in it. You'll love it, and I want you to wear it home. Ask Mlle Boyard for help if you need it.

Now, monsieur, here's your wife's order - and this parcel I think is for you. I'll take you into the changing room.

Don't be silly monsieur, I have to come in with you. How else can we make sure that erection won't ruin the line of your new satin knickers?