Is there any way you can send them an email?
If you don't feel you can do it any other way, write it out in a short note (no more than half a page - about two paragraphs) and hand it to them. That will get the ball rolling. Once they understand what it is you want, they can start asking questions and all you have to do is answer. That very difficulty in initiating a social interaction is a very Aspie sort of problem.
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"Strange, inaccessible worlds exist at our very elbows"
- Howard Phillips Lovecraft