[MMF] How I(M) fucked a stranger MILF with a random guy from the Internet

First of all, English is not my native language, so excuse the funny wording.

Some time ago I, 23M, discovered a big German website, actually an erotic community. Men, women, couples (and more) exchanged about their sexuality, organized events and looked for dates.

One day I saw a couple (he 55, she 44) that spontaneously looked for three men to fuck in a hotel room.
Written down, sent the desired dick pic and cell phone number and then drove 30 minutes to the hotel.
On the spot he would give us the room number.
Freshly showered and shaved I thought about whether a single condom would be enough, but there was no time to buy any more.
At exactly 20 o’clock I entered the almost empty lobby. Near me I noticed another young guy who was staring nervously at his cell phone.
Nothing happened for 10, 20 minutes and I had almost given up when suddenly an unknown number called. A male voice told me that there was still fucking going on in the room and that he would pick us up right away from the lobby.
Shortly afterwards an older but elegant gentleman came and took us with him. On the way he explained that one of them had cancelled and that we, the guy from the lobby and I, would fuck his wife alone. He turned to the guy and told him to fuck her in the pussy with a condom. I could fuck her in the ass and if I wanted to I could do it without a condom.
I thought he was crazy but just nodded.