I mean she says she wants to do porn but only with someone she trusts. I don't remember how she said it exactly but it sounded like me that the implication is that you will be the one who ends up making the porn with her. Probably after she starts out with just masturbation stuff. And probably depending on your choices as well.
Well... I'm not a fan of that kind of thing myself, and my expectation (dreams) is for choose her destiny...
1 Choose to go for the porn industry for her.
Into this option in a realistic way, it would be very difficult, she wants to do adult films, she don't care about using her body, she didn't care if she is with the man she likes... This is a great trouble, in porn actors basically don't choose and if you begin as novice in pornhub like sites then it would be really hard for her to success, but a early winning for MC (if MC success in gain her attention). Another downside is eventually it will be notorious (because Akira will do what Akira's do), so, the restaurant could go to close and with her committing suicide... And i don't have an idea how can you save someone that think you take advantage. This could become MC first bad ending with her suicide and with Akira after him...
2 Choose to look for an audition for her.
This is a long path and i imagine two routes at least, once chose, MC began to work in the restaurant, he noticed the rhythm of the work in the next days, MC in a date with Asami both goes to a Mall spending time like in an anime eating or drinking those soda with ice cream like in anime's talking and pretending while they follow Minato trying to be seen by him. Then MC see a announcement of auditions. Asami at this point maybe could enter too after disappointment in Minato's response, so she'll try to make an audition to show him how feminine and famous she can be and how he (Minato) will regret.
Then, talk after work with Sakuya about an audition, she put nervous but MC convince her. The day comes when both aren't working, they comes late because she was dressing well for that day, the traffic and the amount of people trying for an audition, they see Asami and talk, after conversation Asami enter first and a staff try to talk to Sakuya, she doesn't know what to respond so, MC put in clear he's her agent and staff guy do his questions while Sakuya is nor near, but waiting for enter, depending of responses her destiny will be chose.
MC remember her skills during her work in the restaurant, her voice, her movement, her grace at walking, her dodge of clients, her manners, her tone of voice to clients and when she's making the order to her father in a long distance, her smile, her exceptional memory, her comprenssion of words when clients can't communicate with their voices... With that kind of things MC choose what will come of her in two routes:
2.1 The Birth of a Muse:
MC accompany Sakuya to what place staff guy tells them to go, MC give her confidence, waiting outside and seeing all the madness of staff people going from one side and another, of girls crying because they were rejected, of men with great muscles equally crying for the same reasons, MC fears the worse and think it was a bad idea, then doors open, Sakuya goes out pale and in shock, MC near shit his pants after seeing her like that when she says... She success!, she will become into an idol... Surprisingly, after those great news Asami goes out of the door as well, she give a palm to Sakuya and say "good job companion, we are in the same team", MC just get shocked...
2.2 The Birth of a Star:
MC accompany Sakuya to what place staff guy tells them to go, MC give her confidence, waiting outside and seeing all the madness of staff people going from one side and another, of girls crying because they were rejected, of men with great muscles equally crying for the same reasons, MC fears the worse and think it was a bad idea, then doors open, Sakuya goes out pale and in shock, MC near shit his pants after seeing her like that when she says... She success!, she will appear in a TV novel as protagonist...
Whatever
RNGeusEX have prepared, I don't know if the porn movies will be what it finally comes, well at least for the writing is a bit ambiguous:
Another thing that i suggest is:
First, when MC accompany to her at night, it would be good a sequence of talk, of whatever, about the work, the school, the hobbies... And last but no less important... How the hell Sakuya knows where MC lives?... I mean... MC in his previous life as described was a Beta Male, I don't remember printing a curriculum or writing a form of work or leaving his ID or something for her to know that information... Don't judge me but... If a girl, pretty hot beauty or not that i barely met is waiting outside my house to talk... I would be worry... She's some kind of Naruto Hinata's doppelganger?.