Ok, so about a month ago, me and my girlfriend were at a houseparty. We are both at uni together, and it was one of her friends' houses. Everyone drank loads and started playing 'truth or dare'.
As the night went on, the dares started getting pretty big. One girl who knew my girlfriend fancied one of the guys there dared her to give him a blowjob. Everyone cheered and started chanting for her to do it. The guy just smirked, got up, walked over to her, and offered his hand to go with him to another room. She looked at me nervously but then smiled at him and slowly took his hand. It was the most humiliating and arousing thing I had ever experienced seeing him lead her out the room.
The next quarter of an hour was the longest of my life. When they came back in they were greeted with raptuous applause, the guy grinning and getting high-fives from his friends and my girlfriend looking sheepish but smiling.
She then did something I never saw coming. Instead of going back to her place in the circle on the floor, she walked towards me and gave me a long, slow wet kiss. I knew I could taste cum in her mouth. No-one could quite believe it.
After the game finished and people either went to rooms to fuck or left, she went upstairs with the guy and just sent me a text saying I may as well go home.
She has been having sex with him regularly since then, and hasn't let me have sex with her at all. She now likes me to lick her pussy after she spends time with him, too, and I know they never use condoms. I hate it but it just turns me on so much.