So something like this...
Drag (Ex): If Narek hits with a tentacle attack, the tentacle deals normal damage and latches onto the opponent’s body. Once Narek has latched onto a victim with at least four tentacles, it drags the stuck opponent 10 feet closer each subsequent round (provoking no attack of opportunity) unless that creature breaks free, which requires a DC x Escape Artist check or a DC x Strength check. The check DCs are Strength-based, and the Escape Artist DC includes a +4 racial bonus. Narek can draw in a creature within 10 feet of itself and crush the opponent in the same round.
A tentacle has 20 hit points and can be attacked by making a successful sunder attempt. However, attacking one of Narek's tentacles does not provoke an attack of opportunity. If the tentacle is currently attached to a target, Narek takes a –4 penalty on its opposed attack roll to resist the sunder attempt. Severing Narek's tentacles deals damage to the creature equal to half the limb's hit points. Narek regrows severed limbs within a day.
If Narek begins its turn with at least one tentacle attached, it gains a +2 circumstance bonus on attack rolls to attach additional tentacles for every tentacle that was attached at the beginning of the opponent's turn.
Crush (Ex): Narek can use its whole body to crush any adjacent opponents three or more sizes smaller than itself as a standard action. A crush attack affects as many creatures as can fit under Narek's body. Each creature in the affected area must succeed on a DC X Reflex save or be pinned, automatically taking xdx+(Str and 1/2) points of bludgeoning damage. The save DC is Strength-based. Thereafter, if Narek chooses to maintain the pin, treat it as a normal grapple attack. While pinned, the opponent takes crush damage each round.
Alternatively, we could modify the "reverse bull rush" method we used for the cave fisher...
Drag (Ex): Once a creature sticks to a cave fisher’s filament, the filament fastens onto the opponent’s body. It attempts to drag the victim closer on its turn. This activity resembles the bull rush maneuver, except that the cave fisher drags its victim 10 feet closer +1 foot for each point by which its Strength check exceeds the victim's. If a cave fisher draws a creature to within 5 feet of itself, it can make two claw attacks with a +4 attack bonus in the same round.