A Secret Between You and Me

In a meaningful world of lust where feelings intersect, you will get to the bottom.

[From DLsite English]

Living with his parents, the protagonist, Aoi, leads a dull life of working hard at events. When he meets the heroine, Kaori, his boring life changes forever. He finds himself instantly drawn to her and tries to get her attention...

But he doesn't realize it yet. Behind her smile lurks a hidden darkness.

[From itch.io]