I can’t get the drunken kiss I shared with my half-sister out of my mind

DEAR DEIDRE: I SHARED a drunken kiss at a Christmas party with my half-sister and I can’t get it out of my mind.

I’m 27, she’s 26 and I met her for the first time three months ago after she contacted me out of the blue on Instagram.

She thought we were related and it turns out we have the same father but different mothers.

My dad left my mum after she discovered his affair. I was only one at the time.

A few months after leaving my mum, my dad’s lover had a baby girl.

We have spent a lot of time getting to know each other over the last few weeks and things have been fine.

We talked a lot about Dad messing everyone around. 

After this kiss at the party I feel awkward, but my half-sister doesn’t seem bothered by it. She hasn’t mentioned it.

 I am worried things might get out of hand with her.

 She is all I think about since that night and I don’t know what to do.

DEIDRE SAYS: You two feel an emotional bond but you weren’t raised together, so the incest taboo isn’t fully in place.

Tell yourself firmly the pull you feel is for a sibling: Genetic sexual attraction.

If you let an affair develop, you will end up wrecking so many lives. So be responsible – unlike your dad.

Step back and avoid being alone with her until you feel strong enough to trust your willpower.