I don't think Mistress Devon is still doing 1-to-1 incall sessions? But she certainly knew what she was doing!
I assume you have looked through AW, there are several Mistresses on there in Devon. If none of them take your fancy or your just not sure google DevonDominatrix - Mistress Tania does have a profile on AW, but has zero feedback. I haven't seen her but I have seen one of the other DevonDominatrix Mistresses a few years back and they are definitely the real deal so I have no doubt Mistress Tania would be able to handle you. Be careful what you wish for...