I'm Villain 1 in this hand. I'm glad you posted it, because I was thinking about doing it myself. Probably one of the most thought provoking/absurd hands I've ever been involved in, live or online.
After you 4b the flop, I honestly didn't know what to think, because it was so unexpected. Given that I didn't think you were ever opening 46dd from UTG1 (or 4b the flop with it the off chance you did), I perceived your range to be mainly air simply through process of elimination. As advised by most posters in this thread, I assumed you would flat in pos with K-hi flushes and below.