Okay, CJ, here's a slowplay that worked

[MRBAA]

loose online 3-6 stud game, .50 ante, $1 bring in. One limper to me, with a 9 in the door and I complete to 3 with (KK) 6. Only the limper calls. He's new to the table and short stacked. On fourth street, I catch (KK) 6K. I check, he checks. On fifth I catch an 8, he has xx 947. I bet, he calls. Sixth street, I pair my door card 6, making my house. He catches an 8. I check, he checks. River, I bet, he raises, I three bet he calls. Obviously, kings full is good. Keys to my choices: it was head up (I know you said this is the exception) , probably weak player with not very scary cards and my hand is ultra strong. I think there's a good chance he'd have folded if I bet fourth. And any bets I missed, I got back on the river, yes?