A guy walks finds 2 hot roommates and makes them think he is a sex toy. The mother of one of the girls comes over and borrows him.
I finally found it https://chyoa.com/chapter/Madame-Martell's-Schoolroom-Bordello.463540
Looking for a story where (somewhere down the story-line) the guy ends up in a classroom where the female professor describes the girls in her...
The 2nd one you may be looking for is this one: https://chyoa.com/story/Logical.16034/map
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