I used a drug on the greedy younger sister of the queen's successor who was trying to steal even her fiancé.

Princess Sasha of the Kingdom of Alze, 18 years old. She has a younger sister named Clair, three years her junior, who is extremely greedy, and has even been trying to steal away Sasha's fiancé, the pharmacist Shelt. Complicating matters is the fact that in the Kingdom of Alze, youngest child succession is an iron law, making Clair the next queen. To deal with the tyranny of this future queen, Shelt devises a plan. A plan to have Sasha administer medicine to her... ================================ On 2025/09/20, we ranked 9th overall and 7th in otherworldly romance for the day! Thank you!