Roommate made my wife cum without knowing [MFM]

So this happened last year. Frank, our roommate, my wife Brenda and I decided to stay in and have a game night. We'll usually drink, card games and talk all night.

We do these pretty often, but this time, Brenda and I had a little secret. I had just come back from a business trip so we had not had sex in a couple of weeks. This meant we're both extremely horny. I shared with her the following idea:

She would wear a vibrator all night, but not just any vibrator, the Bluetooth ones which can be configured to vibrate to your music in Spotify. It was Frank's turn to be DJ that night.

Brenda loved the idea and thought the challenge of hiding her pleasure would be fun. She was wearing a long flowery black dress with no panties. She grabbed the vibrator and asked me to help her put it inside. I slipped my hand under her dress to discover her tight shaven pussy was already a little wet. I slipped a finger inside to make sure the vibrator would not hurt her going in. She moaned softly and whispered, "I'd been waiting so long for that."

It didn't take long before she was dripping wet, so I grabbed the egg shaped vibrator and slowly pushed it inside her. Her moaning got a little louder this time. Her tight pussy gripped the vibrator, and it was thick enough that it would not come out easily. I positioned the extended arm of the vibrator right on top of her clit so she would be completely stimulated. We turned it on and synced it to my phone. It was surprisingly quiet.

With everything set, we came out into the living room where Frank was already waiting for us. I asked him to set up some tunes on my phone. The Bluetooth speaker started playing rock music. Brenda gave me a mischievous smile. I'm sure she could feel every drum kick, bass line and guitar solo.

The three of us started chatting, mainly getting caught with our week, as we sipped on beer. After a while, we decided to play Cards Against Humanity. By then, the music had changed to chill hip hop. The heavy bass and consistency of the beats started having an effect on Brenda. She looked at me the way she does when I've been eating her out and she's ready for more. Her expressive eyes were full of desire as she started biting her lips. She started humming along the songs to hide her moans. Frank made a comment about her liking his playlist.

She was beating us at the game by a big margin. Her sense of humor was as good as ever but her cards kept getting more and more sexual. Frank and I were happy to lose.

I decided to make it harder for Brenda by turning up the intensity of the vibrator. I handed my phone to Frank yet again to add more songs. This time, EDM started playing. The first song started with heavy bass and drums. Brenda let out a moan which she tried to disguise as laughter. She composed herself and told us she remembered some jokes from our game earlier. The electronic music and increased intensity were having an effect on her. Her legs were shaking and she kept repositioning herself on the chair. At certain points, I could even make out the vibrator over the music, though I was next to Brenda and Frank was across from us. I wonder if he could hear it.

We were all now a bit drunk so we decided to play truth or dare. The dares were all embarrassing or silly. Brenda had to get up and dance for one of them, which turned out to be a lot sexier than she'd usually be comfortable with. She had been hiding her pleasure very well though. As we got more drunk, we started getting into the truths and the questions got pretty sexual. We all talked about our preferences, previous experiences, and kinks.

We reminded Frank that we're in an open relationship but hadn't found a guy for Brenda. He asked her to describe the guy she'd like. As she did, her voice sounded like it does when she talks dirty to me. I could tell we were all very turned on and drunk.

The music changed one last time to metalcore. The quick kick drums and hardcore screaming must have tested the vibrator's strength as I noticed Brenda could no longer hide it. She disguised moans by singing along but I think Frank could tell something was up. She started breathing heavy and moaning quietly. She closed her eyes and put her head down. She suddenly got up and went to the bathroom. Despite the loud music, I could hear her loud moans.

"Is she okay?" Frank asked.

I responded, "Yeah I think she might've felt sick".

"Ahh okay." Frank said

Brenda later told me she was gonna try to cum in front of us but she wasn't sure she could stay quiet, so she ran inside the bathroom. She said she had multiple orgasms and had to pull out the vibrator before it worse.

When she came back out after 15 minutes, her hair was bit messy and she looked sleepy. She suggested to call it a night which bummed Frank out since he still had music queued up. I don't think he noticed what was going on, but it was definitely a fun night.