Brag: very very sick hand

I was playing live 6-handed 1$/2$ NLHE I just got stacked by a maniac with QQ vs A5o, and this hand came up.

Hero (100bb stack)
villain (90bb stack)

I`m UTG and accidently bet 2$ thinking I`m the big blind, when I noticed it was to late and I see the flop with 5 limpers.

flop KKK, check check, I check ... check check check
turn A, check check, I bet 6$, fold, fold button calls rest folds
river A, I shove, villain calls

board KKKAA

villain shows K6o for KKKK6
hero shows AA for AAAAK

He wouldn`t even have played the hand if it wasn`t for my mistake preflop and I would have raised ...