I’m having a steamy affair with my fiancée’s hot younger sister and now I think I’m falling for her.

DEAR DEIDRE: I AM having sex every chance I get with my fiancée’s younger sister. I can’t resist her but I love my girlfriend.

My partner and I met during university. I’m a graphic designer and she’s got a job in a bank. I’m 23 and she is 24.

 I know my steamy affair with my girlfriend's younger sister is wrong but I just can't resist her

I know my steamy affair with my girlfriend's younger sister is wrong but I just can't resist herCredit: Getty

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We recently bought our first flat and were talking about settling down and starting a family in a year or two.

Things were on the up for us, until I proposed. My girlfriend was over the moon and planned an engagement party.

We had a great time with family and friends but by 1am my fiancée took herself off to bed. Everyone drifted off, leaving her sister and me with the clearing up.

She’s a gorgeous girl of 19 and is at university. We started chatting about the evening and the wedding plans when she dropped a bombshell, saying: “I’ve always wanted a crack at you myself.”

 Things were great with my girlfriend and I even proposed...but then I started seeing her sister behind her back

Things were great with my girlfriend and I even proposed...but then I started seeing her sister behind her backCredit: Alamy

I was shocked but very flattered. I turned to her and said: “Did you mean that?” She nodded her head and fell into my arms.

We had a couple more drinks and then we had a fantastic steamy sex session in the living room.

My fiancée went out the next morning and when her sister came out of our spare room I couldn’t resist having sex with her again.

We both said we should not have done it but also admitted how great it was.

 I know I love my girlfriend but the inevitable happened and I started falling for her sister

I know I love my girlfriend but the inevitable happened and I started falling for her sisterCredit: Getty

The week after this, my fiancée was away on a training course. On the first evening I was settling down to watch a movie when her sister arrived with a bottle of wine.

I invited her in and the inevitable happened. We’re having sex whenever we can now and I am falling for her.

I know I should end this affair but I lust after her so much. I have considered splitting with my fiancée over it but I don’t want to lose her.

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DEIDRE SAYS: You are walking a dangerous line and you know it. Telling your fiancée the truth would devastate her. It would also create havoc in her family.

It is likely that there are similarities between your fiancée and her sister, which could be why you are attracted to them both. But you cannot have them both.

Be firm and tell her sister the affair ends now, at least while you sort out your current relationship.

You should not get married unless you are 100 per cent sure you love your fiancée – and by the sound of things, you can’t be certain.

If the relationship is over, you will have to wait a long time before you come out and show the world her sister is the one for you.

And if the feelings on both sides are genuine, you will wait as long as you need to. But I wonder how much this is about sibling rivalry for her – getting one over on her big sister.

NEXT IN TODAY'S DEAR DEIDRE My dream is to make a life in Australia but I don't want to leave my nieces and nephews


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