Naisho no Tintin Time

Naisho no Tintin Time is a Japanese futanari-themed erotic visual novel.

Ai Sakuraba was an ordinary girl in an all-girls school until she drank an experimental potion cooked up in a mad scientist's laboratory. Rather than gain superpowers, which is how these kinds of stories usually go, Ai ended up with something extra between her legs instead. Unable to go to school with such a throbbing erection on display, Ai is helped out by her best friend Rina, who attempts to calm it by making her ejaculate as much as possible.

As Ai, the player makes decisions throughout the game which determines how the story unfolds.