I do understand what would have been going though your mind at the time, having been in a similar (but not as serious) situation myself years ago. Hopefully you've learned from this mistake and it doesn't happen again. Maybe you could speak to a counselor and find out if there is any action you can safely take about this?
I'm sorry, but this reads like a teenager's badly written angst story.
1) You met a guy who you seemed to like and made a point of sexualizing yourself for his sake. 2) Despite barely knowing him you willingly did drugs with him with no concern for your wellbeing. 3) You claim that you said no, and yet you continued to participate in precursor sexual activity, including mounting him. 4) You had the presence of mind to think his kissing sucked and worry more about work than your wellbeing, as well as was physically capable of putting a stop to it, and yet you still imply that you actively participated. 5) Rather than seeking out a community/group focused on support for victims, you chose a forum that you knew would spark controversy and drama.
I'm calling bullshit on the rape claim. Based on all of your posts, I'm guessing you're either mad because he sucked or you made the entire story up to fill some sick desire to be the centre of a dramafest.
That's rape. I mean, it sounds like you've talked to him about it, and I honestly don't think reporting it would get you anywhere, because of the drugs and such. Oh, man, that's hard. Do you want to get counseling, maybe?
This thread is like a cluster-fuck of bad advice and foot-shooting.
I will keep this short.
It's going to be hard to get a conviction if he pleads the 5th
The drug use makes it even harder because it undermines your testimony to an extent.
Consent is not an issue with drug involvement as consent cannot be given under the influence of drugs! (You were being raped even if you said yes.)
The circumstances leading up to the suspected rape are pretty dire.
Voluntary intoxication isn't a defence for assaulting somebody, let alone raping them.
Let me make one thing perfectly clear, a date-rape drug is any drug that loosens your inhibitions including hash and alcohol, in fact alcohol is the number 1 date rape drug as all sexual encounters under the influence of alcohol are actually rape, as highlighted in the earlier comment.
With that all said and out of the way.
I want you to think about this small chain of logic.
You were lonely, so you gave a guy who gave you a 'strong come on' some face time and got sexually assaulted, you then think that guys aren't worth your time, until you get lonely again...
Then what, repeat?
Make a change, find a guy you like and take things steady, it makes you less vulnerable to people like the guy you mentioned in your post and stops the cycle from repeating.