I think my first kiss was with my aunt
That wasn't a good idea to kiss a relative
I know it wasn't a good idea but one day she just planted a kiss on my lips all of a sudden.
She shouldn't have kissed you on the lips. Was it by accident?
It was like a peck so I didn't mind it that much
I think that some relatives show affection different ways, so as long as it wasn't romantically it should be fine. I'm sure you would be able to tell if it was incestuous or not, but some people just kiss on the lips when greeting each other.