Depends on what her role and character is, if she is a complete utter slut for everyone including MC she can do what she wants. Though it will still be a scene most players that like the MC to get the action, at best will not care for and does nothing for them in the fapping high and a boner killer for others among those. It might attract some cheating/cuckolding fans that like the NPC's to get the action, but if a game is more targeted to the other players it is a bit of a waste of making those renders. Just keep it at description and use that render time for a scene your targeted player base does consider hot and will not turn off even part of them that are more the romantic immersive type that really hates it.
If she is a prudish virgin that needs to be wooed extensively for a stairway to heaven in any other part and it really is a plot point it better be as non sexual as possible and preferably avoidable to at least see it and clearly be forced against her will and her being unhappy about it and not enjoying it even just a little in her thoughts.
Edit: Though not played this (waiting for remake to be further along) so can not say about this dev, but wished devs were better aware that forced rape sex with a main girl, LI, family member (including blackmail, mind control, force and so on) is a major turn off to many people so do not use that in games unless it is a real important plot point or if it is your intention as a dev to write a story that caters to those fetishes or that genre. If you include it it will limit your potential player base, if unavoidable and shown even more so, whenyour game is not targeted at those fetishes.