Taking my bfs V-card

Sooooo Long story short my bf and I had sex (he was a virgin I wasn’t). He finished in about 15-30 mins (I lost track of time). Then we just relaxed a little but I started to tease him and we went for a second round which lasted about 10-15 mins then he came again. I was shocked as a mf two rounds for his first time! Sooo I’m wondering like does he have really good stamina or what? Anyone else got similar experiences?