Shiravune - Megasuki Love Through Lenses with Ayumu Sakura Final (eng) - Adult Sex Game

Ayumu Sakura and Hiro Oikawa are classmates and adulthood friends.
Ayumu's always had feelings for Hiro, but she's never had the courage to tell him.
Hiro's always thought Ayumu was cute, but he thinks of her more like a little sister.
When they were young, they were always together, but these days their friendship has settled at a casual distance.