Ok, I decided to pretty much overhaul the rule structure, so here goes:<br/><br/><strong>Overview:</strong><br/><br/>Unlike normal monsters, tentacle monsters fight using long, flexible appendages, often called tentacles.  Instead of dealing normal HP damage with attacks, tentacle monsters will attempt to restrain and rape a target, forcing her to submit to the monster.  This is done in several stages.  First, a tentacle monster must grab and restrain a target; this is done as a grapple check.  Once a girl is restrained, the monster must spend at least one round pinning her and stripping her clothes and armor off.  Once she is finally naked, the monster can begin to rape her, causing her to gain Pleasure every round.  Each round that she is raped, the victim must make a Will save to avoid an orgasm; failure will cause her to take Ahegao Damage.  Once a character takes Ahegao Damage over her threshold, she finally gives in to the pleasure, and becomes unable to act until she recovers, usually several hours later.<br/><br/>To fight the monsters, characters are able to attack the tentacles themselves.  Tentacles usually have very low health, and are easy to attack.  Damaging a tentacle also deals damage to the main body of the monster, although it is less than if the monster were attacked directly.  Monsters are able to regrow tentacles however, so cutting them off is a temporary solution at best.<br/><br/><strong>Monster actions and grapple checks:</strong><br/><br/>Like normal monsters, a tentacle monster gets a move and standard action each round.  However, they have special options for both standard and full-round actions.  As a standard action, a monster may activate some of its tentacles.  This number varies from monster to monster, but is always at least one, and usually between one-third and one-fourth of its total tentacles.  Tentacles that are not activated remain doing what they were doing; those holding a girl continue to hold her, for instance.  As a full-round action, a monster may activate all of its tentacles.  Each tentacle may do something different, or multiple tentacles may work together on the same action.<br/><br/>Grapple checks work slightly differently for tentacle monsters.  All tentacle monsters have the "Prehensile Tentacles" racial ability, which allows them to make grapple checks without provoking opportunity attacks.  In addition, multiple tentacles may "gang up" on one target; in that case, only one grapple check is made, but with a +3 bonus for each tentacle beyond the first attacking the same target.  Multiple monsters may attempt to grab the same target; in this case, the monster with the highest bonus to its grapple checks makes the roll, while the other monster simply adds for each tentacle being used.<br/><br/>Tentacle monsters must still make a check each round to maintain a grapple on a character.  Such checks only cost one "tentacle activation" however, not a standard action.  When successfully maintaining a grapple, the monster's options are much more limited than other characters.<br/><br/><em>Example: Alice is fighting a tentacle monster with three tentacles.  The monster isn't in range to grab her, so it first spends a move action to get closer.  It has three tentacles, but can only use one with a standard action; it attempts to grab Alice with it, and fails the grapple check.  Next round, it's still within range of Alice, and may take a full-round action to attempt grabbing her with all three tentacles, getting an additional +6 to the roll.</em><br/><br/><strong>Pinning and Stripping Characters:</strong><br/><br/>One of the actions a monster can take while maintaining a grapple is to pin and strip its opponent.  Each character's clothing and armor has an Integrity value equal to 2 plus the clothing or armor's AC bonus; this includes enhancements.  After successfully maintaining a grapple, each active tentacle on the character attempts to tear away her clothing, dealing 1 integrity damage per tentacle.  Note that everything a character is wearing adds to the same integrity; wearing normal clothes under armor does not mean the monster needs to deal full integrity damage to the armor and to the clothes underneath.<br/><br/>If armor is damaged in this way, it also loses its protection; the AC of any armor is reduced by 1 for each point of integrity missing, to a minimum of 0.  This can reduce enhancement bonuses to armor.  However, the armor is easily repaired to be functional, although doing so in the midst of battle would not be wise.<br/><br/>While a tentacle monster can reach beyond its own threatened spaces to grab a character, part of the pin also includes moving the victim to the closest empty space the monster does threaten.<br/><br/><em>Example: After Alice is grabbed, the monster uses all of its tentacles to start stripping her; since all three are still holding her, her armor takes 3 integrity damage.  Her armor's normal AC is 4, meaning she still has 3 out of 6 integrity remaining.  Due to the damages, her armor now only grants her 1 AC.  Later in the fight, the monster is hit with a spell making it staggered.  The three tentacles holding Alice are still holding her, and still give a bonus to its grapple checks, but it can only activate one, and only deals one integrity damage to Alice's armor.</em><br/><br/><strong>Rape, Pleasure, and Ahegao:</strong><br/><br/>The second action a monster can take after maintaining a grapple is to rape a character.  This can only happen to a character that has been fully stripped.  When raping a character, the character gains one pleasure per tentacle holding her, and must make a Will save against her current pleasure.  Success means nothing happens, but failure means that she takes Ahegao Damage as she starts to submit to her sexual urges.  The amount of Ahegao Damage varies depending on the monster, but if she fails the check by enough, the damage is increased.  She takes double damage if she fails by 10 or more, triple if she fails by 20 or more, and so on.  In addition, for every 5 pleasure a character has, she takes a -1 penalty to her attack rolls, AC, CMD, skill checks, and saves.  As with removing clothing, only activated tentacles give the character pleasure.<br/><br/>Pleasure can be gained through other sources, and some spells and abilities may affect how a character reacts to pleasure, but only rape from a monster forces a will save to resist ahegao damage.<br/><br/>If a character escapes from a monster and is no longer being grappled or raped, her pleasure decreases by 5 each round at the start of her turn.<br/><br/><em>Example: After several more turns, Alice finds herself being raped by the monster.  She's already at 6 pleasure, and with three tentacles raping her, she takes another 3 pleasure, bringing her to 9.  Her will save this time is only 7 - not good enough, and she takes some ahegao damage.</em><br/><br/><strong>Fighting against tentacle monsters:</strong><br/><br/>There are several ways to fight against tentacle monsters, beyond simply attacking it and hoping it dies before everyone ends up raped.  Individual tentacles can be targeted and attacked.  Tentacles usually have low health, but are often hard to hit if they're not holding someone still.  Half of any damage dealt to a tentacle is also dealt to the monster itself.<br/><br/>Tentacles can be attacked by an allied character, or by the character being grappled; note that a grappled character can't do anything that requires both hands, and takes a -4 penalty to Dexterity and a -2 penalty to attack rolls.  If all of the tentacles holding a character are killed, that character immediately escapes the grapple.<br/><br/>Monsters will "respawn" a set number of tentacles each round, at the end of its turn.  Such tentacles may not be used for anything until the monster's next turn, but may still be attacked.  A monster cannot spawn more than its starting number of tentacles, but it can choose to heal a wounded tentacle instead of spawning a new one (even if that spawn would put the monster over its limit).  Additionally, a monster may use a full-round action to respawn all of its tentacles; in this case, it still makes a check to maintain all of its grapples, but cannot take actions with the grappled characters.<br/><br/><strong>Miscellaneous rules:</strong><br/><br/>A tentacle monster must always attempt to maintain a grapple on each character it's holding.  If a monster is holding several characters and cannot activate enough tentacles to maintain a grapple on all of them (for instance, if it only activates one tentacle with a standard action, is holding two characters, and cannot take a full-round action), or if it does not activate any tentacles, it may still attempt to maintain a grapple on each character, but it cannot perform any actions with that check.  If a monster does not receive actions (for instance, if it is stunned), it can still attempt to maintain its grapples, but does not get the usual +5 bonus to maintain a grapple.<br/><br/>If a tentacle monster is forced to move, any characters it is grappling are moved with it, each character moving to the closest empty space that the monster threatens after its movement.<br/><br/>Instead of stripping or raping a character with a maintained grapple, the monster may move the character to any space it threatens.  If a monster wants to move on its turn, it must either use a maintained grapple to move characters with it, or it must end its movement so that any characters who do not move are still in a threatened space.<br/><br/>In order to attack a tentacle holding a character, the attacker must draw line of sight to the character being held, not the monster itself.  The monster may block line of sight to its own tentacles in this way.<br/><br/><strong>Special Tentacles:</strong><br/><br/>Sometimes, tentacles can do more than just grapple characters.  Monsters may have special abilities that use a tentacle; for instance, one of a monster's tentacles may be able to cast spells, or may have a spell-like ability.  The tentacle using this ability must usually release whatever it is holding to use this ability, though this is not always the case.  A monster may still maintain a grapple on each character it is holding with other tentacles when it uses a tentacle's special ability, but may not attempt to strip or rape those characters.<br/><br/>Some tentacles may also have special properties.  A partial list of those properties is below:<br/><br/>Armored Tentacles: The monster's tentacles are tougher than its main body, and have a higher AC than usual.<br/><br/>Deadened Tentacles: The monster feels nothing in its tentacles, reducing its bonus to grapple checks, and reducing the bonus for additional tentacles to +2, but the monster takes no damage for tentacles that are attacked or killed.<br/><br/>Thick Tentacles: These tentacles have higher than usual HP, and are harder to kill.<br/><br/>Sticky Tentacles: These tentacles cling to skin and clothing, and are much harder to escape from.<br/><br/>Slimy Tentacles: These tentacles are slick and easier to escape from, but the sensation from touching them makes each tentacle give more pleasure than usual.<br/><br/>Hydra Tentacles: This monster's maximum number of tentacles increases by 1 for each tentacle killed, to a limit of twice its starting tentacles.