Everyone has fantasies. Some people are lucky enough to be married to them.
Trey doesn’t mind that his sister is marrying a woman; he just isn’t comfortable that Dianne is marrying Lara, who Trey himself had an affair with before he and his own wife got married. But as the wedding gives way to the after-party, the subject of fantasies comes up — and brings up all sorts of interesting possibilities that none of the wedding party expected, proving that sometimes truth is greater than fantasy.
(MF, implied MFFM. Explicit language and scenes of sexuality between consenting adults. Adult readers only!)