Having sex for pretty long time

Hello everyone, I am an Indian guy, i am 18 years old, when i was 17 I had sex with my classmate, she was 4 years older than me, I really satisfied her but I couldn't come even after having sex for 40 minutes and I was not even exhausted, I could have gone more but I sensed her vibe and got off as the situation was quite awkward, at a point of time she asked me did I take any pills, I had to withdraw and she had to give me a blowjob to make me cum, is it normal? Has it happened to you guys? And I must say she was great!