unfortunately i don't really have the one that have a modern setting in japanese. Most of my fav yaoi novel setting are from korea or china
I'm not sure if this is what you're looking for but I can recommend you "In the Company of Shadows" it's set in the future where the world is kinda partly destroyed and it includes lots of action, violence and a little later romance and sex. It soon gets really gripping. And it's for free: http://www.inthecompanyofshadows.com/
Sorry for asking it in a manga web.
Please recommend me any good Yaoi novel. You're favorite one will do. But please a modern setting (prefer Japannese).
Really thank you.