The creepy f****r should not be around 15 year old girls. If he thinks his behaviour is acceptable around women, he needs to be taught a very tough lesson.

absolutely no reason to go into her room if it was a mistake he would have left right away. But closing the door behind him and grabbing her when she tried to leave is very telling and if OP wasn't there something would have happened. He showed remarkable restraint I don't think i could have in that situation.

The only thing that is good about this whole situation is that the sister could see she had the support of her family. Her feer and feelings were treated seriously. If she ever feels uneasy in the future with any man (which will probably happen, unfortunately), she's not gonna think she is exaggerating. She now knows how the proper reaction to that kind of situation looks (unlike op ex-gf). Of course, it would be best if she never in her life goes through something like this, but I'm realistic - this is not a woman-friendly world.

I wanna strangle the ex-gf. She's a traitor to our gender. How dare she not believe a fellow female, terrifed female, without even considering the completely inexcusable actions of her creeper brother. Disgusting!

I admire the OP for how hew views his actions in retrospect, showing some nice maturity there for a 20 year old.

Step brother is oh so lucky. At the minimum I would have hospitalized him and called the police. Maybe the morgue instead. OP has a lot of self control

This woman may one day have children. I wonder if she will ignore these incidents (which I am sure were already plenty of) and still keep the step-brother around her potential daughters.

That’s sb got away lightly imo as mother with a 23-20 yr old kids if anyone did this to them even the son I’d be doing time ! Even at 60 now I still would end off ! That filthy creep is a pdf totally and I can tell you now he’s done it before ! What a lovely brother you are standing up for your little sister x I’m glad to hear you have left the gf I hope she learns from it and if your father doesn’t unalive him first making the police report will if nothing else give to cops an excuse to look up his record ! Also even where you are I m sure you can do some digging on social media thank you for protecting your sister blessed be I hope your sister is doing ok now being assaulted your own home is a lot to deal with big time x

Encourage a police report. She's not the first underage girl he's assaulted and won't be the last. Better to get it on record, even if nothing comes of it this time. When the next report comes in, it will be easier on the victim

Thank you for calling out another male for his sexist and dangerous actions; you demonstrated love for your sister.

Women know when they are in danger from men. Good job brother.

If OP's sister stayed in her bedroom while the partying was going on downstairs, did step-brother already know there was a teenager upstairs? Did his sister tell him OP had a little sister? When he went upstairs, after the downstairs washroom had been pointed out to him, he actually was looking for her - no other reason to go upstairs. But to attack her with other people in the house?!? I didn't get the impression they were completely knee-walking drunk, too far gone to hear screaming or shouting. Girlfriend, in addition to saying there's no proof & the 15-year-old sister could have been trying to get attention, outrageously said "nothing really happened". But 1) he went into the bedroom, 2) little sister told him to get out, 3) instead, he closed the door, 4) when she very bravely tried to get past him to get to the door & open it, he grabbed her. & All that's NOTHING? Fortunately, she was able to get the door open & make enough noise, or shouting, for OP to run up the stairs. So, since OP kept step-brother from getting a chance to accomplish step 5), full-on SA, probably with his hand over the little sister's mouth so she couldn't shout, Girlfriend defends step-brother - "nothing really happened"? She's as disgusting as her pervert "interrupted rapist" step-brother. I have so much admiration for OP (tho I do wish he had kicked the step-brother until he ended up falling down the stairs). So proud of him for not hesitating to believe his little sister - not for 1 second - & for recognizing that the girlfriend was not a decent human being - wouldn't even talk to the step- brother abt what had gone on & & broke up with her. (Liked his dad too - going to have a nice little chat with despicable step-brother's parents.) Making a police report is a good idea - & asking the police to do a background check. Also, it's unbelievable what can be found out by Googling a person's name. The therapy for the sister is a great idea, & whatever agency former-girlfriend works for, counseling victims, should be advised as to what actions she excuses & how far things have to go before she believes "something really happened."

I seriously wonder if the ex was giving her step-bro some sort of story about the sister being 'up for it'? She seems to have wanted things dropped/nothing said which seems very strange. Maybe he is abusing her? Definitely needs to be reported to the police cos something really dark is going on in that family....

The fact that he was upstairs and in her room says everything

This honestly scared me. That poor girl. That rapist is just getting way with in and his POS ex is enabling him. Disgusting woman.

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I mean it's not looking good for the sb but still need more info.