30/60 semibluff

[ike]

5 handed Party 30
I open-raise jcth in the CO, button coldcalls, sb folds, bb calls.

Flop: 8d7c2d

BB checks, I check, button bets, bb calls, I raise, both call.

Turn: As

check, bet, fold, call.

River: Ah

BB checks, i bet...

Preflop is routine, and given my flop c/r I think the turn bet is mandatory, but what about the flop c/r? Also, does anyone give up on the river and check behind? FWIW, I checked the flop perfectly happy with the idea of getting a free card, but when it went bet/call I felt like I had a good opportunity for a 3way c/r semibluff ala gonores.