Looking for doujin about health inspection at school

Hey there, I'm desperate to find this doujin stuck in my head. It's about health inspection at school, boys need to provide a sample of their semen, and some girls officially provide assistance. The main guy in the story is in love with that one girl, and she fucks up by drinking it all multiple times (even during class in front of the others). They then have sex (both virgins) to collect the sample, but they don't use a condom and the sample is not good because there's blood in it. She offers to collect the sample at his place instead and things get wild. I think this has 2 episodes aswell, but no matter where I searched or what I searched for, I couldn't find the doujin.

If I remember correctly, the cover art was her (school uniform, long black hair) standing in front of his door, smiling at him. She has a bag with food in one hand while she pushes some hair behind her ear with the other. And I'm pretty sure I've read it on FAKKU at some point.

Thanks for any help!

I love you so much right now, thanks a lot!