<human>: Give me the gist of the text in a nutshell

I don't know how to react now. My younger sister just told me this after her class. Reddit please help my sister. 

Apparently she's been secretly dating her lecturer since last Oct without anyone's knowledge. My sister is just an average looking girl with no past relationships. She takes her studies seriously but somehow lack the affection from guys. This lecturer is an assh*le manipulator. He has no wife/kids. He doesn't even has a car. That's the main factor on how they started.

You see, my sister rides the bus after her classes. And this guy doesn't own a car so eventually he rides the bus as well. Since he's her lecturer, they would have casual chats on the bus sometimes. One thing leads to another, they started dating. It was only last week that he did this to her. Previously they only kissed at max. She doesn't feel right about this whole thing and hence she told me the story. She doesn't love him, according to her. She was only curious as she had never have any past relationships.

Reddit, how can I bring justice upon my sister as a brother???? My sister doesn't want to bring the issue to public for fear of shame. We are from Asian family and the last thing we wouldn't wish for is to bring shame to the family.
<bot>: Sister dated lecturer. He manipulated her. Fingered her. She don't feel right. How to help her?