What is the preferred action on this flop?? Wasn't at the table long, but table was fairly tight passive.

sb 20.60
bb 34.05
utg 25.00
utg+1 27.05
Hero 23.50
btn 27.00

utg posts 0.25

Dealt to Hero 7s5s
utg checks, hero raises to 1.10, btn calls, folds

Flop: 3s6c6s pot 2.80
Hero bets 2.80, btn raises to 5.60...