How about if you just cuddled up with her, and kissed and touched her instead of asking anything? Would she take it from there if she wanted to continue?
You do seem to put yourself through alot of guilt about the past. The past is just that, the past. May I ask what is the reason for your ED?
I believe my H's ED is mostly mental. He seems to be able to hold an erection a little bit longer each time we do get intimate. Unfortunately its only about once a month. H has always been scared to death of needles. He has a weak tummy. He cannot even tolerate the sound of someone vomiting without vomiting himself lol.
Anyway, back to you. Have you thought of C? Have you thought of why you could not bring yourself to ask or indicate ML?