Single Table Sit And Go - Two Pair. How to proceed?

[SaintAces]

86s on Button. Two limp to me and I wanna see a flop.
Suits unimportant

6 lefts all at 800 chips.

Flop is 678. Table is very loose. A bet of 100 on the flop and a raise of 100 more. 200 for me to call. What do I do.



I did the wimpy move and just called.
river is offsuit 2 to make the rainbow and I am happy. When the River 7 comes I am pissed. Check. bet of 100. To me.
(I am thinking underbet?)

what do I do?

Results. (interesting ones) come later.