【T.I.Net】In a world where you get praised for having sex, I can’t have sex (Star Possession Neon.)

Due to the side effects of a vaccine created to overcome an epidemic, the more women have sex, the more their bodies are promised to be disease-free.
The main character, Yukihiro Nakajima, has a semen that has an aphrodisiac effect called “rare semen".
The effect of the semen that causes her to instantly go into heat when she licks it causes her to have sex with her sister who is in heat.