GTS RPG: Setup and ideas for RP in a fantasy setting centering on giantess growth.

Needs a GM + a player. Might include dice rolls to determine the outcome of combat, modified by the size and situations involved, but not too rule-heavy.

Concepts to be chosen/discussed:

Growth from level-up

Growth from winning combat

Growth from sex

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Size is power system:

Abstract:

Simple D&D-like rules for adventuring in a sexualized, size-based world. The base idea is to fight or fuck your way through your Quest: Depending on choices, this can be easy, overpowering and outgrowing the monsters, a fair fight, or becoming the toy of increasingly gigantic monstergirls who fuck your brains out.

The only stat of importance is SIZE, which can be distributed towards height, muscle or hyper-endowment. Depending on the style of game, the enemies will be distributed accordingly.

Stats:

HP: 10.

There is only one basic stat to be changed: Size. Size can be distributed into height, muscle, boobs, cock, ass (and maybe others?), but all these are added into the same size total. This total is the SIZE attribute.

To calculate the SIZE modifier (the + to attack), compare the size of the attacker and defender:

Attacker SIZE / defender SIZE = Size difference.

The SIZE modifier to attack rolls is equal to log(Size difference), using log2. This means that for every time that the attacker is double the size of the defender, he gets another +1 to his roll. (Note: The log scale in use can be changed, this is the prototype).

Example: 10 ft tall attacker vs 5 ft tall defender: 10/5 = 2. Log(2)= 1, thus 1d20+1.

Example 2: 20 ft tall attacker vs 5 ft tall defender: 20/5 = 4. Log(4) = 2, thus 1d20+2

This applies to both attack and defence (though possibly this can be changed by other rules?).

OPTIONS FOR SIZE:

The SIZE stat can be put into different bodily attributes, or simply kept as an ‘inner power’, using the might that it confers without outwardly growing in size.

You calculate your CURRENT SIZE from the STARTING ATTRIBUTES below. Since different starting numbers can be used, the calculating concerns itself with giving you a multiplier (and indeed, since the attributes start at 100, they might as well be percentages). Thus, a Height of 200 means that your height has DOUBLED.

(Note: There is the added calculation of multiplying by Height % for the othe attributes, because of course a doubling in height also means a doubling in breast or cock size, proportionally).

Starting attributes:

Height: 100

Muscle: 100

Breasts: 100

Cock: 100

Ass: 100

(add others? Nipples, Pussy, Balls, Clit, Cum production?)

Total: 500 SIZE

Combat system:

Attacker and Defender rolls 1d20 + Size-Modifier. In case of tie, attacker wins.

If attacker wins the roll, he carries out his attack. (Deal 2 HP damage).

If defender wins, the roles switch and now defender is on the attack.

Special attacks:

Go for the head! Attack a sensitive spot, deal 1 more damage, while taking -2 to the attack roll.

Disarm: Take -2 to attack roll, deal no damage, but remove enemy’s weapon. (Takes 1 successful roll to regain weapon)

Disarmed-Attack: -5 to attack roll, deal 1 damage.

Grapple: -2 to attack roll, deal no damage, but grapple opponent: Opponent’s only action will be to escape grapple.

Choke: If already grappled opponent, +2 to attack roll, deal 2 damage.

Combat Resolution:

Player Wins:

Roll 1dX, where X is your defeated enemy’s total SIZE. You gain that amount of size points, to be distributed as you see fit.

In addition, you can have your way with your enemy (cuz sex-based RPGs work like that.)

Player Loses:

Roll 1dX, where X is your total SIZE. Your enemy gains that size, and may fuck you or finish you off.

VARIANT RULES:

No shrink: Player and/or Monsters cannot shrink. Extra Size points are awarded to the other part instead.

Baseline: Cannot shrink below 100% of SIZE attributes.

SPECIAL ATTACKS: (only for NPCs at the moment. When adding more size, can be determined by GM or rolled randomly (though I’d have to make a table for that)).

Drain Size (physical): If opponent is grappled, steal 20% of size from a given attribute and add it to her own.

Drain Size (magical): With a spell, drain size: Like above, but only 10%.

SPECIAL PERKS:

Grow from punishment: With every successful hit upon them, grows 20% larger.

Size-or-death! Grows 10% larger every turn until combat ends.

NPCs:

Succubus

Bandit

Elf Ranger

Sorceress

Orc Raider

SEX RULES:

Growth from sex: After having sex, roll 1dX, where X is 25% of your partner’s total SIZE. Add the result to your SIZE.