What is the scenario described? Who described it?
My scenario is that at fifteen I lived with the 25 year old, rent free and when it was obvious I wasn’t really in to her, she didn’t object to me inviting my girlfriend my own age, around. A three bedroom apartment, so not an issue. A few months later, the other girl came to collect me to live with her, but I already had a girlfriend by then. Didn’t stop her from buying me clothes and jewellery and even giving me money to take my girlfriend out at the weekend. Asked me what my girlfriend(18) had that she didn’t have. I was 16. She was perhaps 23, I don’t remember exactly now. It’s not as if she wasn’t attractive. Men would wolf-whistle her in the street and I often wondered why she picked me. But my girlfriend was just as nice and not a ‘Madame’.
So I know how it is from many different angles.