Here is the complete Morrigan romance dialogue with the Grey Warden. Morrigan is by far my all-time favourite character in the series and my first Dragon Age Origins romance option.

The Dragon Age Origins Morrigan romance dialogue is the longest and most extensive dialogue I've experienced with any companion from the Bioware franchise, hence why the video is just over an hour long.

The Morrigan storyline is an absolute masterpiece, not to mention all the other storylines and I'd highly recommend you play this game to experience possibly one of the best RPGs of all time.