This took place at halloween. I had the house for myself, and was sitting drinking with the neighbour. He is a middle aged guy and constantly complained about problems with his wife. Late at night my sister and her friend came in. Quite tipsy, but disappointed the party they visited had been a bore. They had worked really hard on their costumes. Both girls were dressed as fairies. My sister in a green and and her friend in a blue dress, with complementary wings in the same hue. They wore some sort of glittering makeup. To top it off, they had headband wreaths with ledband lights in all kinds of blinking colours, and the same kind of lights at different places on their wings. When the lights were on, they certainly lit up the area, the point being the center of attention I guess.
So the girls were in a good mood, and were flirting freely and happily. Them getting drinks of the girly type only added to their behaviour. He must have seen something I didn’t, because when the girls were gone to the bathroom, he said he hoped I wouldn’t be mad if he had sex with my sister this night. I thought he was joking and didn’t think much of it.