I think when he calls the c/r, he's got something. I haven't narrowed it down exactly, but I have a feeling it's still either trips (most likely 9s), A-K (Some people won't lay this down on a flop even when they whiff this badly), or of course AA down to 10-10 (JJ obviously not being considered). I've seen this line with trips ALOT. They'll c/c or raise/call on the flop and try to get you to bet on the turn.

With that in mind, I decided to check the turn, even though the turn card put a flush and straight draw on the board. I still don't think any straights are likely, given he'd have to have 3-bet with 10-7 or 7-5. Here's how it played out.

Turn: ($14.85) 8 (2 players)
Hero checks, Button bets $3.50, Hero calls $3.50

Does a call here seem bad? He's certainly giving me good odds as long as he doesn't have trips or an over pair. I think a re-raise is bad because I'm probably only getting called by better here and I have enough information to assume that the 8 didn't directly help him.