I'm with a friend who I've known for a few weeks now, she's really nice and we get along really well in pretty much everything. We're watching Dune, one of our shared favourite books. We're cuddling, a bit, whilst we watch it. I feel her wrist for her pulse. 
Later, we've drunk a bit more. Coconut rum. We kiss. It's really fun. We kiss a few more times. Then we just cuddle and rest and begin to get stressed out. One of her best friends is my girlfriend, she introduced us. We have an open relationship but the details were vague, and I am stressed. I feel I have broken our trust, I have ended something amazing in my life. We spend the next few hours stressed and angry at ourselves. Later, I feel better about it, and I realise that I don't think I broke trust. It still feels sticky, though, and I do not ell her.