Based on your statement, your friend has committed no crime. You have, though, and be careful about posting such comments on a public forum.
I see no point in them pressing charges. They have been repaid for the $70 so what do they stand to gain. It would be had kharma for them to do so.
Good Luck !
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You should recommend that your parents speak with a defense attorney first about the possibility of you being charged with a crime under these circumstances before they contact law enforcement about this.