I c/c c/c donk my flush draw HU

[Alobar]

villian in this hand is 21/10/2.5

5 handed

Im in BB with 8[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/club.gif[/img].
Button open raises, I call

Flop: 4[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img]

I check, he bets, I call

Turn: 3[img]/images/graemlins/diamond.gif[/img]

I check, he bets, I call

River 5[img]/images/graemlins/spade.gif[/img]

I bet


I figured the flop c/r had zero chance of accomplishing anything and would just make it more expensive on me being OOP, same with the turn.

Im not sure how I feel about the river donk, It feels obvious what im doing, but i figure hed prolly think I would have raised at some point with the draw. But im hoping he has some hand often enough that isnt worth a call, even if he suspects im full of it, which I Figured would be pretty often given a button open raise in a 5 handed game. Tho the fact he actually bet the turn I think works against me for that scenerio to be true....anyway, thoughts?