Threesome With My Erotic Teacher

Sometime ago I went to France for an exchange program. I was going to live there for a year. The first month was very rough, I didn't know anyone, and my French wasn't that good.
One day at a class, this beautiful blonde sat right next to me and started asking questions about my life. Once I told her I was Brazilian, she started to be even more gentle and polite, was that a sign? I didn't really get it. She asked for my number and I went back home.
When the clock changed to 00:00 I got a text from her saying she was right outside my dorm with a bottle of wine and a friend. I asked her where she wanted to go, and she told me "upstairs". I didn't even think of anything and let them in.
As she knocked on my door, I was already dressed with 3 glasses in hand when I realized that her "friend" was actually our teacher who listened to the conversation that I was Brazilian and became curious.
I was 21 at the time, as the blonde was 19 and the teacher was 32. Let's just say she had a lot of experience to share and two slaves to do what the fuck she wanted.
We started drinking and talking for a while, and then it all got a lot more serious with me and the blonde as students of an erotic teacher. They went out by 06:00.