Secret Cohabitation with Big Sister — A Milk Tea Bond Thicker Than Blood

Secret Cohabitation with Big Sister — A Milk Tea Bond Thicker Than Blood is a 2D dating sim for players who like slow-burn romance stories with a sandbox structure. The tone stays quiet and domestic rather than dramatic.

Story

A brother and sister, no longer burdened by money troubles thanks to an unnamed sponsor, settle into an ordinary shared life. That ordinary life starts to shift when an "Intimacy Gauge" appears above their heads, marking a bond that no longer fits the word "normal." Shared meals, quiet evenings, and small physical contact build up until the affection they once faked for a streaming audience becomes real, eventually pushing them past the line they were never supposed to cross.

Gameplay

Play centers on daily routines with the sister, where cooking, watching movies, and other shared moments raise the Intimacy Gauge over time. Choices and repeated interactions shift the relationship from cautious to open, unlocking new scenes and dialogue as trust and attraction grow. The sandbox format lets players set the pace of each day rather than following a fixed script.

Features

• Intimacy Gauge system that visibly tracks the siblings' changing relationship
• Animated 2D scenes tied to relationship progress
• Sandbox-style daily schedule for pacing romance and routine side by side