My Girlfriend is Everyone’s Toilet Bitch Final by Eiciffee - Adult Sex Game

Yuka Ootsuki is my ch*ldhood friend who I've been dating since junior high school.
She is always cheerful, has a sense of justice, and is popular with both men and women.
The couple gets along well and one day they finally spend a night together.
Then, a certain test was conducted at the school.
It is a test to find out who are "immune resistant people". Those that don't get sick.
The result was positive for the girlfriend. The protagonist was gut-punched, but his girlfriend looked somewhat mystified.
Her parents' factory went bankrupt.
In other words, her parents' family was heavily in debt and she had to work.
And a job that would provide immediate income, with the condition lending her body to others to protect them from the virus
... she turned into a public toilet