I think it's okay to fantasize about Serrin and her brother. Implying that Coffee or SilverRaptor fantasizes about them... not so much.
Let's face it, Serrin's not exactly a pristine virgin, nor is her brother (I guess). They seem to have a healthy, vigorous sex drive and enjoy exercising it.
Edit: Oh, and Gicko, please. It's getting annoying. If people aren't sucked in by your signature, they're not likely to be sucked in by invisible text.