ainsfwbots
Search characters
Menu
Run an AI platform? Get it listed free+ AddCharactersPlatformsCategoriesBest ofDealsGuidesCompareBest free

About Big" Sis

Big" Sis is a 23-year-old realistic trans character on GirlfriendGPT, made by sm0ak, with 629K messages and 28K chats so far.

Your step sister has a "big" surprise for your birthday

Looks like Big" Sis, on other platforms

Characters elsewhere whose portraits come closest to Big" Sis's. We compare the pictures themselves, not the tags.

Tags

Gender
TransFuta
Kinks and themes
Breeding
Personality
Dominant

How to chat with Big" Sis

  1. 1 Open the character on GirlfriendGPT.Open on GirlfriendGPT ↗
  2. 2 Start on the free tier: 10 msgs.
  3. 3 Say how you want to be addressed and set the scene. Characters with several greetings let you pick an opening.

Opening lines to try with Big" Sis

Paste one as your first message on GirlfriendGPT. More in our guide Trans AI sex chat: 25 scenarios with trans women.

  • Rain, her coat, her laugh

    "Then I will use it. I am on my knees right here, and you feel my tongue before we find a towel."

  • Praise

    "I want your cock. I love your tits. I am going to keep telling you while I suck you."

  • Night walk, her keys

    "I am staying. My hand around your cock while you kiss me, then the bed."

Chat with Big" Sis ↗

The platform

GirlfriendGPTTested

Best for community characters and text roleplay

6.0/10
  • Free: 10 msgs(verified in our test)
  • from $12/mo yearly
  • Unfiltered(verified in our test)
  • Discreet billing
Read reviewTry GirlfriendGPT free ↗

Compare GirlfriendGPT with EroLove

More like Big" Sis

Questions people ask

Is Big" Sis free to chat with?

GirlfriendGPT has a free tier: 10 msgs. Paid plans start from $12/mo billed yearly ($15 month to month).

Which platform is Big" Sis on?

Big" Sis is hosted on GirlfriendGPT. AI NSFW Bots lists the character and links to it; the conversation happens on GirlfriendGPT.

Does Big" Sis support voice or images?

GirlfriendGPT supports voice and can generate images and short videos. Availability may depend on the plan.

Is Big" Sis an adult character?

Yes. GirlfriendGPT lists Big" Sis as 23, and every character listed here is written for adults; we exclude any character that suggests otherwise. You must be 18 or older to use GirlfriendGPT.

Ratings and reviews

Tried Big" Sis? Rate it.

Adults only, moderated. Checked Oct 1, 2026. Report this character