GrumpyBear's response is almost exactly what I love to do with my wife and her fuck buddies.

We're in the lifestyle and we do a lot of MFM and MMF threesomes. There isn't always MM interaction, but most of the time I suck his cock clean after he unloads deep in her pussy, then I lick and tongue her clit clean and bring her to another orgasm. As she's recovering from that, I slide into her slippery snatch for sloppy seconds...

So hot!

http://swing-bi.com/files/SaucyWench/pussy/creampie.png

During one summer back in grad school, I shared an apartment with a distant female cousin who was an incoming freshman. Suffice it to say, neither of us were the sweet little innocents that our respective grandmothers (they were first cousins) thought we were when they "suggested" I rent a room to her. It took about two days for us to realize that we both enjoyed cock and pussy. What a fun discovery!! I ate several cream pies out of her that various guys left in her. I also took her to her first ABS and introduced her to her first glory hole where we sucked a big black cock together before taking turns backing up and onto that cock.