Getting back to pure spanking, I spanked Naina at Sandys when I saw he a month or so ago.
It started spontaneously, initially very gentle and ended up pretty strong, far harder than I'd have expected. Definitely not with all my strength, but I her butt cheeks were reddened. It was very erotic, as was the whole experience with her.
Incidentally, Naina is extremely sexy and well worth a visit IMO.