Is this normal?

When I was twelve years old I came out of the shower and went into my room only to find my sixteen year old sister and her twenty-two year old boyfriend having sex on my bed. When I asked why they were doing it on my bed thy siad that they broke my sisters bed. Anyway i said that if they didn't get out of my room I would tell mom that they were having sex when they weren't allowed to but my sister said "No you won't" then she grabbed me and tuen threw me on the bed and ripped my towel off. Her boyfriend held me down while. My sister started to lick my testicles, which then really started to turn me on. That's when my sister noticed my hard-on. At that moment her boyfriend attempted to teabag me. I tried to resist but my sister was making me so hot that i just let him. Anyway to finish the story off, I just let them f**k me. Is this declared rape or what?