Just because someone considers something to be rape, doesn't mean it actually is rape. You have to consider if that person actually is telling you a factually correct statement or is just full of shit. You also have to consider the law. I don't know which places you're talking about but let's examine what they are in the USA and UK anyway.
There are different types of rape, statutory rape being one of them. Quote:
"If both parties are under the age of 18, it is not common for either to face statutory rape charges. This is because it can be extremely challenging to determine who should be considered the victim and who, the perpetrator. In such cases, it is highly unlikely that prosecutors will decide to file charges. Instead, they may simply receive counseling about the dangers of sex before adulthood. However, if one person is 18 and has sex with a girlfriend or boyfriend who is underage, he or she might be charged with statutory rape." - Source:
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All characters are all stated to be above 18, so above the age of consent in the game, so this wouldn't ever be classed as statutory rape.
Now, let's go into the legal definitions of rape in the USA and UK.
1. The legal definition of
rape is when a person intentionally penetrates another's vagina, anus or mouth with a penis, without the other person's consent - UK Police definition (Was the first one that showed up on Google).
2. The penetration, no matter how slight, of the vagina or anus with any body part or object, or oral penetration by a sex organ of another person, without the consent of the victim. - USA Department of Justice definition -
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The key word in both sentences being consent, which is open to interpretation. Going to go with wiki here.
"The act may be carried out by physical force, coercion, abuse of authority, or against a person who is incapable of giving valid consent, such as one who is unconscious, incapacitated, has an intellectual disability."
Both parties in the game consented to the sex by a drunken Megan and sober MC at the party. They had also both consented to oral penetration earlier in the day, then when Megan said no to vaginal penetration and ran away, the MC didn't pursue. As far as the law is concerned, they already penetrated each other. Megan clearly got cold feet. The MC also voiced his dismay, but he had no authority over Megan.
When they meet again later, Megan had clearly gotten herself drunk by her own accord. She wasn't coerced by anyone, but herself and she initiated the sex. The MC complied and Megan never complained again. Until she told him not to cum inside her, but was too late. However, that small act in that split second can't be classified as rape either as they were already in the midst of penetration and the MC wasn't given enough time or warning within reason to pull out in time.
The biggest problem here is that it'd be insanely hard to prove the truth and would just be based upon the word of both parties. There were also no other people aware of this or observing or any cameras. So, unless either one of them is mispresenting or withholding the truth, no. This would never be classed as rape and you wouldn't ever go to jail for this unless you have a corrupted jury.
Also, I'm pretty sure thatMegan would have to be the one to file a charge of rape against the MC, since no one else would be aware of their sex that night. Chloe being the other after she sees the dribble of cum down her best friend's leg would suspect, but until her best friend told her who, she wouldn't be sure. Plus, I'm pretty sure that Megan would never have even considered it rape and if she told her friend the story, Chloe wouldn't either.
In other words, those who would consider this rape don't know what the fuck they're talking about. Especially since they'd probably never know the full picture like us who have played the game and seen it all.