5/10NL FT Full house on River what to do?

[telltale]

The table is very weak tight. So any PFraise is folded to from basically any position. Your in BB (900) with KK and three people limp. You raise to 50 and only the button calls. Fp is Ts8s8c. You bet 100 and he calls. Turn is 8 giving you 8s over Ks. You check he checks. River is 2d. What now? If you check and he bets the pot what then? Or do you lead into him? Etc.