Nothing wrong with worldbuilding; it helps make the world feel more real. Obviously since this is just a little introduction there's not much to comment on regarding the story yet. Didn't really notice any spelling or grammatical errors, so that's a good start.

I'll vote B and D, this time, with the significant other being Natalie, a brunette with blue eyes who has her hair up in a casual, slightly messy updo (reference: http://img.careforhair.co.uk/wp-content/uploads/selena-gomez-brunette-hair-in-simple-curly-updo-for-prom.jpg). She's wearing a white, backless mini summer dress with an extremely deep plunging neckline. Naturally, Natalia is going completely commando as well. I couldn't find a real-world example, so here are two shots to illustrate what I have in mind:
Reference for the front: http://www.ibra-fashion.com/images/201005/goods_img/39_P_1273418433956.jpg, except with the neckline going down to her pubic mound, showing her belly button but still covering her pussy (as long as she doesn't bend over too much). The dress is about the length shown, possibly an inch shorter.
Reference for the back: http://3.bp.blogspot.com/-sWHkJOq_OMI/UMd54vjTyoI/AAAAAAAABOg/PYjziskqYtM/s1600/aishwarya-rai-hot-in-bikini3.jpg. This shows how the dress stays up: rather than going around the neck like in the front shot, it ties around her shoulders, leaving her entire back exposed from her hairline down to the top of her buttcrack (the updo is to increase the effect and avoid covering anything).

Natalie is the more realistic and down-to-earth one of the couple, but she's very curious, having a bit of a scientist mindset. She was dragged along to SnuffCon by her overly enthousiastic girlfriend, but she's secretly fascinated by the whole concept, especially the displays that don't immediately kill the victim: she's very hesitant to try anything herself, but she'd love to ask people what it feels like as they have their limbs amputated, their organs pulled out, etc.