Patryn of Elvenshae said:It's +4 / -1 / +4 / -1 (for your TWF with the longsword and shortsword you're carrying*), and additional attacks at +1 / +1 for the two tentacles.
The penalty on your natural weapons is off of your highest BAB, irrespective of whether or not you are also using TWF. Note that your off-hand shortsword and your tentacles only apply 1/2 of your Str bonus to damage, as they are treated as a secondary natural attack.
* - Adjust appropriately based on actual weapons loadout.