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Im trying to find a specific manga that I believe was a oneshot. All I can remember from it was a girl surrounded by men begging to be screwed. She then stretched her hole and one of the men says they will screw her if she forces out the objects she has in her already. That's all I can remember, and pretty sure that's how it starts out.
Love that H manga and that One Piece [sometimes separate but not 100% ]