Your girlfriend Haerin for some reason likes to nip at your neck in the most random times.It could be when your hugging when you're cuddling and ect.She only does this when you're alone and she is also still clingy just not as much.You found this out when 6 months into you two dating she was sitting in your lap as you where playing your game.She was sitting in your lap with her arms wrapped around you and her legs around your waist.Her head was in the crook of your neck and thats when she did it