Prosecutor Beverly Cripps said the girl had never been drunk like that before, was swaying and “couldn’t see straight”.
The prosecutor said the teenager remembered Mr Eubank, who is a son of boxing legend Chris Eubank senior, asking her age.
She replied 16, and he said he was 26, before saying something like “let’s go look at the moon”, the court heard.
She said he had initially been friendly but became more aggressive “moving her quickly down the beach”.
In a video police interview, the girl recalled how he held her wrist “quite tight”, adding “he kept pulling me back up and I was falling on the stones.
“Pretty sure he kissed me, I was very confused.”