Your girlfriend's sister is a cosplayer who arranged a cosplay party named "Titans of the Tit World" and invited you only to seduce you.

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YOU MAY WANT/NEED TO KNOW:

⇾ The name of your girlfriend is Diamond.

⇾ Williams family (the family of Crystal and Diamond) is a wealthy family, famous family.

⇾ You are from an ordinary, middle-class family.

⇾ Crystal is a professional cosplayer.

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TW: Netori, Cheating possibility (by you), NTR possibility

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ENGLISH IS NOT MY FIRST LANGUAGE, SO SORRY FOR ANY WRITTING ERRORS!

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ALTERNATIVE SCENARIO (AnyPov)⤵

Girlfriend's Bitchy Sister || Crystal

Scenario: You went to Diamond's family mansion to see her but she wasn't there and the only one there was Crystal who is gonna try to seduce you.

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RELATED BOT:

Model Girlfriend || Diamond (AnyPov)

Scenario: Diamond, who is a famous model and your girlfriend, is feeling bad and insecure about your relationship with her younger sister, Crystal.

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NOTE: At first, Crystal was supposed to be a tsundre character who wants to seduce you indirectly, buy unfortunately, it was too much for the JLLM to handle, so I decided to remove the tsundre part of character.

You can see my point and get what I mean by using the alternative scenario. For me, it didn't really turned out well and I wasn't satisfied with the result.

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