Sexual assault?

So when I was 14 a freshman, I went over to by best friends house. She had an older brother (18), and we were all hanging out in her brothers room. He asked my best friend to go downstairs and get us all drink and she did. As soon as she left the room he pulled down his pants and started asking me to give him a blow job. I told him no, that I didn't want to, he started begging and I just kept telling him no. So then he grabbed the back of my head and tried to push me down on him, I kept pushing away. After about a minute or two we heard my friend coming up the stairs and he stopped and pulled his pants back up. As a 14 year old I didn't think of it as that big a deal, but now that I'm 17 and look back on it, I've started feeling like he had assaulted me. Especially considering that I was so young and he was 18. Was I assaulted/harassed? Or am I just being dramatic?

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