[Rocket Chousashitsu (Koza)] I can't disobey my big sister Jeanne (FateGrand Order) (English)

A blonde, glasses‑wearing big‑breasted sister in a school‑style uniform teases her younger brother, inviting him into intimate skin‑to‑skin contact. Their playful yet forbidden encounter escalates as they explore each other's bodies, with the brother overwhelmed by desire while the sister revels in control. The story unfolds with teasing dialogue and escalating passion, promising a tantalizing sibling rivalry turned erotic adventure.