Pinky Nightmare

The dim-witted, virgin Aichi Tachibana has a one-sided rivalry with Suou, a popular, nonchalant, handsome classmate. One day, Aichi happens to pick up a plushie from the trash — except it was actually a demon!? The demon named Pinky tricks Aichi into a “Succubus Substitute Contract," tasked with collecting semen from men. His target: the guy that grinds his gears, Suou! When Aichi makes his move… it seems that Suou isn’t opposed to his advances? (Source: Libre, translated) Note: Includes one extra chapter.