Middle Pair vs preflop 3-bettor

[LoaferGee12]

Main villain here is 50/26 so his 3-bet range is pretty wide here. He seems pretty in line preflop, and I'm not sure if he does or doesn't raise overcards.
Other guy is a typical loose-passive chump.

Party Poker 1.00/2.00 Hold'em <font color="#0000FF">(5 handed)</font> link

Preflop: Hero is UTG with 7[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises</font>, <font color="#666666">1 folds</font>, <font color="#CC3333">Button 3-bets</font>, <font color="#666666">1 folds</font>, BB calls, Hero calls.

Flop: (9.50 SB) 6[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, Hero needs a good line

My plan was to check-raise if it's HU, and check-call / donk the turn if it's still 3-way. Not sure why, but that's what I had in mind. I think if this flop wasn't monotone I'm check-raising that flop no matter what. Thoughts?