Perfect Match draught (Little)

Perfect Match draught
(Potion) This potion remains inert until the essence of a living being is added. This potion grows or shrinks your sexual organs to match the target's ideal size. It also causes your body to scale with your genital size to avoid any complications (such as loss of consciousness due to lack of blood flow to the brain). Lasts for 1h30m

Reference
Acquired in Chapter 31 "The spoils of… war?"