Find Pornstar – [Request] Subreddits or videos where 2 friends or strangers (M/F) are in an innocent situation and it ends up being sexual

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It starts off as an innocent situation like a sleepover or hanging out after school for example, but somehow they start getting turned on and they explore each other, ending in them doing sexual acts.
Preferably with plot before the situation so we get to see the their relationship beforehand, but not a requirement.