Maybe it's weird, but she's not a very close relative and of course, we didn't have sex.
Anyway I never had a girlfriend before, I only dated a few girls but always got turned down. Then she came to a visit for 2 months and I found her very attractive (she was 16 back then, cute red hair girl). She used to sleep in my room and I slept in the living rm.
One night we were in my room, listening to some music and talking. Then I started to fondle her hair and hands after a few minutes she grabbed my head and kissed me, so it was HER who started it, and I just went with the flow. Anyway I have no regrets, she taught me how to kiss and I had more confidence afterwards.