Iirc, there's a girl skipping class or something and she's outside the school, and suddenly another student she doesn't know come along (a sly, confident-looking sort of girl). One thing leads to another and they're making out/having sex outdoors, near a fence maybe or something.
It's pretty vague but the thing I remember most about it is MC lying and saying she has sexual experience, because she didn't want to be mocked or something, and the other girl revealing that it's her first time (so her lie was for nothing/based on false assumptions/self consciousness)
I tried looking up possible tags but well, nsfw
lots of sex
school girl
are super common tags and it wouldn't have lead anywhere
If anyone has any idea of what this could be, it'd be a great help to me, thank you :D