She is not the same subject of the previous dream.

We entered into a very messy bedroom.
Very messy.
Clutter is everywhere.
We ended up on a bed that was patchy, messy and not in the best condition.
Lydia layed on me, playfully.
She had a look of playful lust on her face.
We were kissing. It was intense
She started undressing me.
When she unzipped my pants, she smiled and said "perfect!"
I looked down and it was anything BUT perfect.
I had a condom on and it looked very worn.
The tip of the condom fell off.
It wasn't perfect, I thought, it's disgusting looking.
She started sucking on me.
She wasn't gagging but she must have been thinking the same thing as me.
However she was sucking me.

The dream ended there.
When I woke up, I distanced myself from the dream.
It couldn't possibly mean to have sex with her.
She's happily married with kids.

Therefore it must have some sort of different meaning.

A friend who I consulted with the dream suggested that it perhaps is a reflection of my feelings with having a sexual encounter with someone who's already involved.

It makes sense to me. I feel repulsed by the idea.