Lost with a set 4 way

[TheWorstPlayer]

UTG is pretty rockish. Tight passive pre and post flop.

MP is pretty tight preflop. Very passive preflop, pretty passive postflop. About two hands ago I doubled him up when I flopped top and bottom pair and he flopped top two. On that hand, he called the flop in position, and then pushed the turn. For what that's worth.

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) converter

saw flop

BB ($123.55)
UTG ($240.70)
MP ($470.70)
TWP ($385.65)
SB ($275.35)

Preflop: TWP is Button with 8[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img]. SB posts a blind of $1.
UTG calls $2, <font color="#CC3333">MP raises to $6</font>, TWP calls $6, SB (poster) calls $5, <font color="#666666">1 fold</font>, UTG calls $4.

Flop: ($26) K[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">UTG bets $8</font>, <font color="#CC3333">MP raises to $35</font>, TWP...?

Really not sure what to do here. Do I protect against a flush draw? Do I flat call? I honestly don't think I have been in this situation before where someone else led small into the pfr who raised and I had a set behind on a flush draw board. Any advice?