Rei's story so far is very confusing.
- MC is sent by Kate to the Online Shop in the Mall to pick up the faucet.
- The free roam ends when mc enters the Online Shop, so the following dialog with Rei, getting the faucet from Rei and taking the job is unavoidable. (kinetic event)
- After that mc is free to choose his working days in the Online Shop. Rei's story progresses with each day mc works with her but mc could also choose to stay at home for the next weeks. (sandbox)
- After a few days working with Ray the unavoidable "rape" event happens.
- After that there is the new story that the shop salesman was on vacation and the shop was closed.
If Rei was just using the shop to bait mc for an evening of bdsm fun, then she invested a lot of time and effort into fake working several days in the Online Shop. Processing Kate's order and handing out the faucet felt real, so Rei either used the real shop or she set up the whole story together with Kate who sent mc to Rei. However Kate's reaction to the BDSM magazine later showed that Kate might be interested in the theme but is probably not yet involved with Rei.
So the most plausible interpretation is that Rei worked as vacation replacement in the Online Shop, met mc by accident, chose him as victim and on her last workday she invited him home for some one-time fun. The salesman back from vacation was either wrongly informed about his shop or he was lying.
Problem is why would a business woman like Rei work in the Online Shop as vacation replacement at all? She obviously knew the shop and the work very well. She also did not tell mc about the temporary nature of his job ...
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Ambiguous comments by Rei :
"Why would you ever be scared?"
"You always liked it when I made you do things at my whim!"
"This is just our little game"
"I promise you will like it."
"You've been very good at it before."
"Mmm! This dick!"
"I really didn't know it was gonna be so good."
"... I wanna feel your dick just once more ..."
"I knew from the start you would like this game ..."
"... and that I'm gonna fuck you like no other girl has fucked you before."
"I'm really gonna miss you when you go, you know?"
-> I don't think Rei and mc met before his accident or had sex before. Her ambiguous comments probably just reference the work with mc in the office in the past days.
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I actually liked the Rei character and how the Rei story started, Rei and mc working together, getting into more and more lewd situations at work, etc.
I did not like the mc getting drugged and the non-consensual sex. The sex scene itself was hot because Rei has a beautiful model but the situation felt wrong. It would have been different if the mc would have chosen to sell himself for an evening to Rei ... or if the game would have provided more than one way to earn the 500 $ to progress Alexandra's story ...
I also did not like that Rei later said that it was a one time thing for her. Looking at the Patreon page however hints that Rei is not a major character, she is not part of the new banner image with 10 women and she was also not part of the Side Story poll in January.