I am so happy for you. KNEW you could do it. It does help to feel better. Not a "magic bullet" but if you're blessed with supportive parents.... there's nothing on which you need their support more than this.
You can take the "Part B" discussion as a given. Probably safe to assume they won't ask about forensic details, but there's a greater chance they will be concerned about your emotional state and how your therapy / recovery is proceeding.
The feeling of floaty exhaustion and being immersively distracted by all surrounding details is so, so true. After I told my parents, I couldn't drive for the rest of that day; I'm honestly surprised you were able to ride your bike home after. Talk about overachieving....
I remember that late last year, after you'd told your wife, you were mulling whether to tell your parents as well, feeling conflicted because you thought it would allow the perp to hurt 4 people instead of 2. But now I think you see it's the other way around - there's an extra 2 people who can help you heal, who can cheer you up and cheer you on.
So very, very glad you saw it through, my friend.
"Don't think it hasn't been a little slice of Heaven just because it hasn't!" --Bugs Bunny