Okay. So there is a Dom and a Sub version of the classroom harasser. If you give in or refuse to tell on them, they will be dom. If you tell on them/refuse to let them steal your homework they will be subby.
When visiting the media lab, eventually the harasser will ask for you to flash them, or to video you. After this eventually you will have a guest lecturer instead of the normal professor (If I remember correctly) and you will get the bathroom sex scene. This scene repeats a few times.
After this, he will find you and confront you when walking around campus during the day. I don't know if this is restricted to certain time of day, but seems fairly RNG (like the people stealing your clothes in the shower for the Best Friend story start). It's like the common toll event, but more rare and with harasser instead.
Then finally, there is one more even I know of back in the Media lab. But I haven't been able to find the prerequisite skill levels to trigger. Or maybe it's inclination based. I guess you could fiddle around in cheats menu to find out.