24-Jikan Ohogoe Doubutsu Koubi no Yakata ~Futanari Ojou-sama ga Bakunyuu Maid ni Chinpo Kanri Sareru Hanashi~

Buy official english version on Reika Saionji is a genius. One morning, she wakes up and finds a dick has sprouted from her crotch where there wasn't one before. She's great at studying, but has no sexual experience! She asks her maid, Michika Kirisaki, to help calm down her raging boner.