Two hands against the same player

Hand 1:
Party Poker No-Limit Hold'em, $0.50 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

BB ($51.30)
UTG ($53.45)
UTG+1 ($8.75)
MP1 ($53.73)
Hero ($56.85)
MP3 ($8)
CO ($91.87)
Button ($49.35)
SB ($27.20)

Preflop: Hero is MP2 with T, T.
3 folds, Hero raises to $2.5, 2 folds, Button calls $2.50, 2 folds.

Flop: ($5.75) 7, T, 7 (2 players)
Hero checks, Button bets $1.5, Hero calls $1.50.

Turn: ($8.75) 7 (2 players)
Hero checks, Button bets $5, Hero calls $5.

River: ($18.75) 4 (2 players)
Hero checks, Button bets $18.5, Hero ??

Then a little bit later...

Hand 2:
Party Poker No-Limit Hold'em, $0.50 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

UTG+1 ($11.90)
UTG+2 ($47.38)
MP1 ($10.72)
MP2 ($46.38)
Hero ($80.90)
CO ($9.25)
Button ($71.57)
SB ($175.85)
BB ($47.50)
UTG ($43.20)

Preflop: Hero is MP3 with J, T.
5 folds, Hero raises to $2.5, 2 folds, SB calls $2.25, 1 fold.

Flop: ($5.50) 8, T, 2 (2 players)
SB checks, Hero bets $4, SB calls $4.

Turn: ($13.50) J (2 players)
SB checks, Hero bets $10, SB raises to $57, Hero ??

Hand 1: What hands can you put him on that beat you? If he has a 7, then pay him off. Otherwise, you beat all other hands he could be holding. It looks like he slow played JJ+ here and is thinking you have a T. I push him allin here.

Hand 2: Tough spot. There are a lot of hands he could have which he would bet this way. Could be a slow played set (or JJ) who thinks you could draw out a flush on the river. Could be a baby flush who is trying to protect his lead. Could be an overpair with a flush re-draw. In most cases, you are behind though so unless the guy is a maniac, you have to fold. I only call this if the guy is the table donk.