I hooked up with my step cousin awhile back. Incest or not?

We're technically "related by marriage" of course. Not blood. Not necessarily a hookup, but I didn't know what else to call it. There was some kissing and fingering involved. At 14 I think. No oral or intercourse. I know it's really weird/creepy, but it was a long time ago. He still tries to hit on me and it feels weird... What do you think?

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