Helen’s NTR Summer School Training [Gyakushuu no chii ushi]

Description: 
As Ichimotsu Saoya, a middle-aged physical education teacher, you witness your masturbatory crush, the recent international student Helen Anderson, having sex with a student from another class, Ninomiya.
Now, you must plot your revenge by tricking (or rather, blackmailing) Helen into extra summer school lessons during her summer vacation with a sexual consent contract.
As her teacher, corrupt the young, naive student from America by pushing her to perform erotic actions on you! However, you’re not alone in pursuing Miss Anderson. Ninomiya and his best friend, Sota,
are both in the running to winning her heart (and voluptuous body)! View the story through both Ninomiya’s and Ichimotsu’s perspectives as you decide Helen’s fate.

Will Ninomiya emerge victorious to enjoy the final summer festival with Helen remaining his girlfriend? Will the aging Ichimotsu take her as his own prize? Or will Sota steal her away?
Enjoy the many branches, routes, and endings as you choose what happens.