Watching your wife suck other people's dicks is a buzz kill. And she understands that by licking other people's testicles, her husband's boner will get sharper. So these swinger couples swap to sharpen their senses, bring back the novelty, and make their orgasms brighter. Only I would make the lighting not so bright, then there would be more understatement and less embarrassment.
The lady tries her best, but such a cock far exceeds the ability of her mouth to swallow a cock! I must say that it goes in her front too, with quite a palpable strain. I wonder, after such a giant, would she enjoy a smaller cock?