I'm looking for a manga about a girl who can smell when people are sexually aroused I just remember reading it along time ago. I think it was something like, she wakes up one day and goes to school, where she realizes some people smell funny. I think later some dude tells her she can smell when the people around her are sexually aroused. I know it sounds really weird for me to be searching for this... It's not that I want to read it thatt much, but I just remembered reading it and it's bothering me since I can't seem to find it...
I'm pretty sure it's Para Paru :)

It is a shoujo manga about a girl who wakes up one day finding herself being able to smell certain scents from the people around her. She also hears a strange voice inside her head. Later with the help of a friend, she finds out that an alien got inside and is now living in her head, and it is the one responsible for giving her the enhanced ability of smell. The certain scents are explained and analysed to be associated to sexual arousal and physical attraction, as well as dishonesty and nervousness, etc.

There are other people in the same school who receive similar abilities in taste, touch and hearing. The manga is ongoing and touches on sensitive and mature matters such as rape and pregnancy.