I don't know about open raising with ajo, I only do it from later position.

Flop: Bet out, you raised pre-flop and hit part of the flop. C/R by BB could be top pair or two pair, with no reads it's unpossible to know if he is c/r a draw.

Turn: You might try pushing back at the BB and raising here. Your hand has improved with the stright draw and not improved any flush draws.

River: You have a really good hand that is vulnerable, if you bet and they come along (what happened to mp3? I'll assume he is still there on the river) you can get two more BB. If you check behind and mp3 wakes up and leads out, BB calls and you call you can still get two more BB. If you check, mp3 bets and BB raises I think you can let it go, one of them has a K.

I'd probaby bet the river, get raised by BB, call, lose and remember the check behind play...