NL25: flopped set on coordinated board

[Guthrie]

I'm trying NL cash after two years of SnGs, so I may have a tendency to use an axe where a knife would be better. I'm 22.33/12.84 and 2.31BB/100 over 20K hands. I'm fairly comfortable on a tight table where people will actually fold and there's some chance to read hands, but often feel completely lost on tables full of donks who raise and call everything and see who can hit the river the hardest.

So here are two 55 hands where I flopped a set on a coordinated board. Advice is welcome on all streets.

CO is 53.06/10.2 over a small number of hands.

Poker Stars, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

CO: $10.50
BTN: $22.30
SB: $15.55
BB: $6.15
UTG: $25.60
Hero (MP): $16.90

Pre-Flop: 5[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/spade.gif[/img] dealt to Hero (MP)
UTG folds, Hero calls $0.25, CO calls $0.25, BTN folds, SB calls $0.15, BB checks

Flop: ($1) 5[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/club.gif[/img] (4 Players)
<font color="red">SB bets $0.25</font>, <font color="red">BB raises to $1</font>, Hero calls $1, CO calls $1, SB folds

Turn: ($4.25) 3[img]/images/graemlins/heart.gif[/img] (3 Players)
BB checks, <font color="red">Hero bets $3.75</font>, CO calls $3.75, BB folds

River: ($11.75) Q[img]/images/graemlins/club.gif[/img] (2 Players)
Hero ?


Button is solid, 23.20/17.39. MP is 37.14/9.52, and has called my TPTK down twice until he hit rr 2 pair.

I figure MP will call just about anything, but Button might raise with a pair or two overs, so I go for a check/raise.

As played, reraise or push?

Poker Stars, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

UTG: $25.70
MP: $21.65
CO: $8.40
BTN: $53.95
SB: $24.50
Hero (BB): $22.10

Pre-Flop: 5[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/spade.gif[/img] dealt to Hero (BB)
<font color="red">UTG raises to $1</font>, MP calls $1, CO folds, BTN calls $1, SB folds, Hero calls $0.75

Flop: ($4.10) 2[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] (4 Players)
<font color="red">Hero bets $1</font>, UTG folds, <font color="red">MP raises to $2.75</font>, BTN calls $2.75, Hero ?