Libido Effect

Graduate students Garib and Jin-Joo, who study insects, are a couple who have been dating for a long time since they were freshmen. Boredom comes to them, who have lived together for over 3 years. One day, trembling in fear that Garib would leave him, Jin-Joo let an unknown insect sting his finger, Libidine, who had just entered the laboratory. Jin-Joo suddenly starts to get an erection in front of Garib, who reassures him that nothing will happen, and Garib, a graduate student who gets excited because of this unusual phenomenon, begins to glow. Meanwhile, their advisor 'Coral' and assistant 'Bada' also find out Libidine's secret. They embark on a plan to use Libidine to fuck each other...

(Source: Peanutoon, translated)