This one happened during my second year in university. I was sharing an apartment with a girl i started to go to university with and we shared quite a few classes as well. We were getting along great and quickly became friends. It didn’t take me long to figure out that she was a slut as well and in fact she was an even bigger slut than i was! I was 20 at the time, while she was 23 and she had quite a lot of experience.
She was also local to the city we were studying in, while i had to move there when i started to go to university.
With time we got more and more comfortable with sharing each others experiences and being more open about our slutty sides. With that, it also turned out that she was pretty dominant by nature she became somewhat of a mentoring figure to me. I think she enjoyed turning my sluttiness up a little bit. We never really had sex with each other, aside from me eating her out a few times and she fingering me a few times.