Mmmmm - for me, the sexiest thing would be to see two straight, or bi-curious guys together....the fantasies are too numerous to mention, but one recurring theme is to be involved in a foursome (two bi-curious couples):

The girl and I are getting it on, and the guys are watching, touching themselves as they enjoy the sight of our Sapphic pleasures.....at some point, the guys stop touching themselves and start touching each other. The girl and I would glance over and see what was happening, adding fuel to the flames, as it were.

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