Villain is a passive reg. Appreciate any thoughts on turn and river

***** Hand History for hand : 215580 *****
PL OMAHA Blinds(0.25/0.5) - 12/26/2015 6:27:19 AM
Table 2824
Seat 5 is dealer
Total no of players : 2
Seat 6: sammyd ( 135.97 )
Seat 4: 35BULLETS35 ( 107.44 ) [SITOUT]
Seat 5: leedsfc08 ( 215.46 )
Blinds(0.25/0.5)

leedsfc08 posts Small Blind [0.25]
sammyd posts Big Blind [0.5]

sammyd dealt [*,*,*,*]
leedsfc08 dealt [5S,9S,8D,AS]

leedsfc08 raises [1.5].
sammyd calls [1.25].
** Dealing Flop **[7S, 4C, 10C]
sammyd checks.
leedsfc08 bets[2.7].
sammyd calls [2.7].
** Dealing Turn **[6D]
sammyd checks.
leedsfc08 bets[7.35].
sammyd raises [15.2].
leedsfc08 calls [7.85].
** Dealing River **[2C]
sammyd checks.
leedsfc08 bets[31.76].

Hopefully this is easier to read now (I play on a small site and the hand histories wont convert). It's a 6max table that has just gone heads up. I'm not comfortable stacking off on the turn because vs this guy I can't get it in good this deep, I'm just chopping or maybe getting free-rolled. Villain is a passive reg so I dont really know what to do on the river. I think his turn min-raise means he has 98 a lot. I'm pretty new at this game but any semi-competent Villain would bet any flush on the river wouldn't they? In which case I should bet to get him off chops? Is my sizing ok?

Seat 6: VILLAIN ( 135.97 )
Seat 5: HERO ( 215.46 )


HERO posts Small Blind [0.25]
VILLAIN posts Big Blind [0.5]

HERO dealt [5s9s8dAs]


Preflop
HERO raises to $1.75 Villain Calls $1.25

Flop [$3.50]
[7s4c10c]
Villain Checks Hero Bets $2.70 Villain Calls $2.70

Turn [$8.90]
[7s4c10c][6d]
Villain Checks Hero Bets $7.35 Villain Raises to $15.20 Hero Calls $7.85

River [$39.30]
[7s4c10c][6d][2c]
Villain Checks Hero Bets $31.76]

weird betsizing by villain 99xx 88xx with a NFD?, did he c/r river?

there are icons you can use in the smiles (click go advanced) for suits.

or copy these :

best to wait a bit before posting results so as to not colour the analysis