Hey did you notice Asuna finding Inoda's key? This makes the whole "can be used only a few times" detail pointless. I wonder if Fujino thought how ridiculous that reason was and thought of a more practical reason for Inoda not having free access to Asuna's home anymore.
I notice that and Asuna keeping the key for now, she telling she will start to use light clothes to work because is getting warmer so new set of clothes for her is coming, she found a used condom in the trash and think if her mom brought someone home, the only place locked is her mom bedroom maybe Inoda was there with Kyoko, there is milk missing from the fridge probably Inoda drank, but the most important detail in all that was the bottle of wine.
Because what Asuna said when she found it " looks good maybe a should have some after a long day at work to relax"
that's look to me as Fujino hinting about Asuna getting tipsy or drunk after some shit day and endup having sex with Inoda at home, I woundnt be surprise if he endup using the oldest excuse in book for IRL sex, alcohol.
And about the key idk since she keep it maybe could lead to another Lustfull Night event since that one started with a key, she grab the wrong key come back home late and can't get in, her mom no where to be found, she try Kirito but for any reason no response, she try Inoda and end up in his flat all over agein with kirito sleeping or loged in next door, Fujino recycling ideas. See only in the first five minutes of game you already 2 possibles scenarios for IRL sex