Thanks for everyones responce, we are going to talk about it indepth before we do it.Just so everyone knows we have been in a relation ship for 10 years. I was thinking of just letting a "the guy" watch and play with him self while we have sex and maby let him touch. There will probably be no penetration from "the guy".
This is for her not me or tho i dont really mind. My fantasy is for a 2 girl 3 sum but my partner is dead against it, which i have excepted.