Tenraku no In-On Shoujo

The story follows two girls, a senpai and her junior from the light music club, who fall into a lascivious trap after school activities. Unable to resist, both are dragged into a whirlwind of extreme sexual situations, including forced acts and the loss of their virginity to strangers. As their bodies and minds are corroded, the protagonists face a turning point that will determine their destiny.

[Translated From DLsite]