early age?, . Options

[tooeffingcrazy]

okay well my sister and her bf has been dating for quite a while now. 10 months already. well anywyas, he came over to our house (well snuck in cause my mom would faint if she found out my sister is oging out) for their 10 month anny. yeah he went to their rooma and they did stuff. but when they went downstairs they were watching t.v, but i was curious what they were doing, so i went down the stairs slowly and quietly and when i peeked over to the right, i see him on top of her, banging her. it was a awkward picture, and it was scary too. btw she is only 14 which really scares me. im not sure if im over reacting, cause i think 14 is quite young. hmm. i tried talking to her, all she does is scream at me like "GO AWAY SHUTTUP I DON'T WANT TO TALK TO YOU" so there is no way i can talk to her about what hse has done. i asked her if she went to 4th base yet (all the way) and she said, were my clothes off. then i said "i doesn't need to be off" then she started scareming at me. im not quite sure if they had it, but the puzzle pieces fit together. so i was wondering if i should tell her best friend to talk to her about it, cause she obviosly won't listen to me. and i need to tell someone besides my parents. cause they will not approve of that. but if i tell her best friend, she might think she is quite awkward and they might not be friends anymore.

deng this is so confusing. so what should i do ?