Grunch
I think with the LAG IP to our direct left I prefer to 3bet or fold preflop. We're going to get ourselves in a lot of difficult postflop situations OOP to an aggro player otherwise. KTs makes a reasonable 3betting hand as part of either an extended value range or a tight polarised range if opener is either way too loose or way overfolding pre or postflop in 3bet pots. If his raise is just tight I'd fold.
As played I think I'd just give up on the flop. It's very multiway and the board hits a big chunk of most people's ranges so V2's bet signifies more strength than usual - and we're OOP.
Only way I'd continue vs a LAG OOP with this type of hand is flop X/R if I thought V was out of line. But as I said above - there's no reason to believe he is in this exact spot.
Why would you think LAG has a lot of draws here? He's IP and can take a free card instead of betting. When the board is this wet and pot is multiway even a LAG is going to tighten up on the semibluffs. The point of semibluffs is fold-equity: villain clearly has none when his opponents are flatting OOP with gutshots