Our last assignment was to the Engineer School at Ft Belvoir, Va. Our kids were in school; we were still young. I was eyeing Army retirement and either a Civil Service job or a Consulting position with a contractor doing big jobs for the U S Government.

Our twins quickly developed an interest in the public transportation around Washington D C and the surrounding Northern Virginia area. There is more to do for free in that area than most places we'd been could even be purchased. Early on, their Saturdays would be spent touring. When Summer break came, they were gone almost every day. When asked about what they were doing, they would talk about discoveries with excitement. Now it was just touring. When pressed, they admitted they found the library fascinating.

One Tuesday, I had a day to prepare for a briefing. I took the day but already had the briefing material set. I waited at the library. When they came in, I stayed out of site. I followed them to a discrete section for World History. I found a place to watch where they went in from a floor above. I read and watched. They came out one behind the other with a man in between. All three disappeared under where I was sitting. About 25 minutes later, the twins went back to the history section. An hour passed. I was about to leave when they appeared again. This time a woman was between them. Again, they disappeared under where I was seated. An hour later, nothing. I went home after scouting the history section. It was empty of people.

I looked around the area under where I had been but there was much library there. There were two elevators as well as stairs. They could have gone anywhere. The next time I decided to learn more about the kids' interest in history, was Saturday. I got there early; found a place I hoped to watch without being seen. This was on the same floor as the history section. It happened again; an adult in the middle of the twins walking in column. They took an elevator to the basement. I left. Two weeks later, I took up a spot in the basement where I could see the elevator. When they came out, they walked toward me but I was looking thru a shelf of books I'd made an opening in. They went into a room the adult had a key for. They closed the door behind them. I asked the front service desk about the room. She wasn't sure. She consulted with an older lady there. It was a room for listening to recorded things that could not leave the library.

I asked about getting access. The room had to be booked by a member in good standing in advance. It could only be booked for 50 minutes max at a time. The key had to be returned immediately. I thought about that on the way home. The adults were getting the twins into the room to listen to historical recordings and staying with them for the session.

Over the next two weeks, I tried to find a way to get them to talk about that without tipping my hand, I was spying on them.

Finally, I asked if I could see the room. I was granted escorted access. There were comfortable chairs and several booths equipped with over the ear headphones. The row of booths had booths on both sides. Maybe that was to allow two people to face each other while listening to the same thing. I got a waiver for the member in good standing for a year thing because of my Security Clearance and more than 20 years in service. I used that access on Friday, after work, to place a couple of discrete cameras in that room.

On Saturday, the twins were off touring again. I sat in my office at home, switching from news on the computer to the cameras in the room. About 10:10, someone activated the motion detectors on the cameras. It was the twins and a man. They did not put anything on to listen with; they did put a tape on to play silently. I suppose that was to ensure security would see something going on in the room. They quickly undressed the man and started blowing him. He was trying to undress one of the twins while the other was on him. before he got both of them undressed, he popped his nut. After that, time was spent making sure he was not dripping anything before he dressed himself. The twins got dressed too. They all sat around for another 15 minutes before leaving.

I took my wife to the library to see the room. I prepared her for a story she would have trouble believing. At home, I showed her the set up. She recognized the room. She asked about the reason for it. I made her wait to see for herself. She shocked me with her reaction. I wanted her to have time to digest it before reacting. I put her in the office alone. I waited in the kitchen, preparing BBQ stuff for the afternoon. She came out of the office, sat at the table and said, "I don't know whether to find out who that man was or masturbate. I am wet."

I asked, "Why find out who the man is?"

She said, "Money!"

I said, "We are not hurting for money. We are definitely not going to blackmail anyone here. Everyone here matters and they might know someone who could stop a blackmailer in a hurry."

"In that case, " she said, "I want some of that."

"You want to take a stranger to the room?"

"No. I want the twins. I watched them with a woman the first hour and a man the second."

"Give this some help then." I offered as I pushed my cock against her cheek. I had walked behind her at the table and was massaging her trapeze muscles.

She eagerly took me. It didn't last long. I put her on the table, sat down to taste her myself. Then I fucked her on the table from a standing position as she lay across the table.

We finished, ate on the patio and talked about how to fuck the twins that night.