Gunslingermonk

Me and my Gf's sister are alone together in my living room on the sofa.
I pull her closer and she doesn't resist. We begin to kiss passionately (thinking back this is probably where I should have used a RC). I remember feeling amazing, the rush of being with her was out of this world. I then feel this pang of disappointment and dread as I realize that I am cheating. She then pulls me closer and we continue to have sex (I think, it gets real hazy after this part).

This is all I remember as Im normally rubbish at remembering dream and am trying to get better, apologies for the x rated nature but I believe it was this that helped me remember.

I also think that there were two points that I should have RC'ed and I can see that now, both when we were kissing and about to have sex as I know we would both be against this for obvious reasons.

Any thoughts would be helpful as I am looking for advice on how to become lucid.