5/10 Prima - weird flop play with KK?

[AZK]

5/10 Prima, I have about 2.5k behind and make it 40 to go with red KK UTG +2. 2 callers mp with about 1k, SB with about 2k we take a flop of J86 all clubs. I move the cursor to make a 1/2 - 2/3 pot bet like always and for a brief second think, why bet when I can't really feel great about calling a raise. I check, checked around. Turn is a red 8, SB leads out for 120, I call, MP folds. River is a red jack. He checks, I check behind. Thoughts?