Does lunging spell touch stack with lunge?

You can increase the reach of your spells' melee touch attacks by 5 feet until the end of your turn by taking a –2 penalty to your AC until your next turn. You must decide to use this ability before you attempt any attacks on your turn.

and

You can increase the reach of your melee attacks by 5 feet until the end of your turn by taking a –2 penalty to your AC until your next turn. You must decide to use this ability before any attacks are made.

It feels like basically the same feat, which makes me believe they may be unintended to work together. However, I see no indication that the wording on these two prevents you from taking a -4 penalty to AC in order to gain a +10 feet to your spellstrike.

I don't see a RAW reason they couldn't, but as a GM I would not allow these to stack, that would give a medium or small creature a 15'reach.

Also don't see a reason this can't work.
but I also don't think it's broken. It would give 15 touch attack reach, but a pretty sizable ac penalty. Penalty for a class that generally ha a hrd time with AC and HP amounts, and thats still pretty close. 5ft step for a reach full attack, or a charge with a non reach.
Sure they usually would have other defenses.. but I feel like it balances out well enough.

Though if you have a spell that gives you multiple touch attacks, usuable as if they were normal attacks. IT could get messy from a full attack or AOO stuff.

However!
I note you said "spell strike" as in the magus ability?
That I believe would only benefit from Lunge. Because it's no longer a spell's melee touch attack. It's a spell put on a normal melee attack. So that wont' stack for that kind of attack. But if you just normal cast the shocking grasp it will be longer range.

I agree with Manwolf, it seems like they stack.

Though I don't think it's that big of a deal:
1) it's only till the end of your turn
2) you are taking a -4 to your AC
3) it costs you two feats to pull off

To me it seems like a fair trade off if someone wanted to do it.

Yeah there's a significant reduction in AD, nothing that a 12th level wizard (or Fighter 6, wizard 6 to have a +6 BAB and 6 ranks in Spellcraft) can't offset as he gets ready for combat, but a 15' reach, same as a Huge character, or similar to giving someone Spring Attack with 2 feats instead of 3. I would say, yes the rules may way allow it, but there no way I will. My momma didn't raise no dummy.

Not only would those stack, as far as I can tell they would also stack with Long Arm and Longarm Bracers. 25' touch attacks may be overdoing it, though...

Yeah, at that point it's just getting silly.

Hmm. What if you combined that all with an aberrent sorcerer? You can flavor him as mister fantastic.

Does he have to multiclass as a vigilante at that point?

Hmm. What if you combined that all with an aberrent sorcerer? You can flavor him as mister fantastic.

Or you could make Dhalsim!

I kind of want to build a sorcerer on this concept, simply because slapping people from across the map seems hilarious to me.

Take some Unchained Rogue too and disable traps from 20'away

Take some Unchained Rogue too and disable traps from 20'away

(have not read unchained). They disable traps with touch attacks?

No, you would have a 20'reach with those freakish arms. Arcane Trickster can do some of these things at range