Hmm, if you really want a adult romance it should be one of the main-foci of the game. Nothing you do as a side-quest ("By the way Grey Warden, I'm really in love with you since you gave me three plushed bunnies and a pint of beer"), but a really integral part of the story.

Game stories are purely egoistical, which I mean FOCUSED on the actions of the player. With a real love-story you have to share your experience with another being, that you hopefully like and do not regret to have rescued at one point in the game. You have to simulate LOVE, which is very difficult, that's why it needs this focus. And I don't have on my mind which game ever produced this feeling of love, besides the occasional Flashback with pleasant memories ... oh wait, I have an example.

Silent Hill 2. But it wasn't a very pleasant game^^.

Edit: And The Witcher Series. But only, because they knew how to show much affection between Triss and Geralt, without Triss constanly talking about how wonderful her Witcher is. Insteed she shows it with little gestures. Like hugging him. An affectionate hug can say so much more than every one-sided monologue.

Last edited by Zelon; 23/10/15 10:53 AM.