So, I keep having dreams about doing "it" with my girlfriend's mom. I know this isn't normal, but the more I dream about it, the more "normal" it becomes. By "normal", I mean it seems to be a nightly routine. Even though it's not every night that I dream of her mom and I doing "it", I at least get to the seduction before I wake up.

I wish I knew why I do, as well as what could possibly cause it. This has been going on for a couple weeks now and it's at the point where I find myself feeling awkward when I'm in the same room as her. I don't look at her in any suggestive way or even think about her in such ways.

The dreams have been anything between a random mix of random things, or some kind of story that seems to belong in a video game, but always ends in one of the 2 ways mentioned above.

If it helps to know, my girlfriend and I have been dating for nearly 2 years come May. We have a strong relationship, so it bothers me that I would even dream of "doing" another woman, let alone being with another woman. Please help.

Many sexual dreams just happen, but this seems to be an obsession of some sort. It does not sound healthy since it is making you feel bad, when in a room with her. At this point perhaps some counseling

Don't let dreams rule your waking life. Just about all of us have had dreams in which we do things we wouldn't do (probably all of us, but we don't all remember them).
Although the science of dreaming is still just a lot of theories, dreaming really does seem to be a lot of snippets of real experience all mixed together in any old way. I actually believe that we dream in a rapid slide show and then merge them into a moving picture when we wake up. I've had many occasions when I was dreaming and woke suddenly, and recall rapid pictures moving by in a jumbled mess and all out of sequence.
That being said, and with countless people reporting that they had 'substitute' people in their dreams, often with no possible basis in real life, it's possible that there is a real basis. But that can be anything from a color or a smell or the first letter of someone's name being the same as the crush you had when you were 12, all the way to something more 'real,' like a coy remark she made that triggered a worry in you that she was flirting!

Anyway... refuse to think about it and it will go away.

It's not what you think. People in dreams usually represent characteristics they have, not the actual person. People often dream of having sex with someone they are comfortable with, often their own relatives. This is just your subconcious mind preparing for sexual maturity, and as long as you realize it's not for real there should be no problem. In your case the fact that it's your gf's mom might indicate your desire to have relations with your girlfriend when she is more grown up like her mom. Nothing wrong with that!

You can't control your dreams or the feelings they stir, or are stirred by. But you have control your actions. Bet keep fantasies and dreams in their place, dreamland and fantasyville.

Always stay within the boundaries of good behavior, and let good orderly direction be the reality you live in, and those dreams and fantasies won't hurt you.