I started masturbating around the age of 13. I had started out only humping my stuffed animals but eventually found rubbing my clit got me off harder.
One night when I was 18 I had a friend over. She fell asleep pretty early and I just kept tossing and turning. We were alone in the house that night and I wandered downstairs and ended up watching some porn. I quickly got turned on and since my friend was asleep. I got naked and started rubbing myself. I was so into it I never realized she had walked into the room! I was embarrassed but there was no way of hiding the obvious.
'Keep going!' she said as she bit her lip. 'That's so hot, I love your moaning'.
This instantly turned me on more so I started rubbing my clit faster, she reached over and played with my nipples.
A few weeks later at another sleepover we got to explore each others bodies and finger each other!