Holding onto the towel around his waist, William gingerly stepped out of the wet bathroom. And into the bedroom of their hotel room.

His wife was sitting on the edge of the bed. Buffy was in a bathrobe. She had a towel wrapped around her head. She had one leg thrown over the other. She was gently rubbing some lotion into her legs, but with a faraway look in her eyes. She looked completely spaced out.

Lost in her own thoughts, Buffy rubbed her palms together. William saw she was wearing her wedding ring.

"Buffy?" William whispered.

It took a moment for her to register his voice. Finally, she looked up. It was as if she was momentarily surprised to see him.

"Will," Buffy whispered.

Husband and wife locked eyes. And both they remembered what happened last night…

William's had returned to the couch. Where he'd proceeded to pour himself half a dozen drinks. Trying to numb the pain.

He still couldn't believe it. All that had happened tonight. It felt like a lifetime had passed. His mind ran over the events.

First, Xander flirted with Buffy all evening. Worse, she had flirted back. Right in front of him. Then, they'd sent him on a booze run. When he returned, he'd been stunned. To find the billionaire and his wife on the couch. Locked in a steamy kiss.

"Jesus," William muttered. Downing yet another glass of booze.

Then, Xander had cornered him in the kitchen. And delivered his devastating assessment of Buffy. That it was only a matter of time before she cheated on him. Next, his wife had fessed up about her part in events that sordid night.

William now wiped his eyes.

Afterwards, he'd watched as Xander and Buffy slow danced together. Then, the hammer blow fell. They'd gone into the bedroom. Together. To "view a painting".

Then, the pictures on Buffy's Insta account. Of herself on a bed. In sexy lingerie and high heels. Quite a departure from her usual fare of cooking recipes and cute dogs. Giving every man she knew – and thousands she didn't – A grade material for their spank bank.

"Fuck," William whispered.

Finally, what he'd seen after he'd opened the door.

Xander relaxing on the bed. With his jacket off. Admiring Buffy. Who was now in a diamond bra and silver panties. First, his wife had struck a couple of sexy poses for the billionaire. As if she were a model. But then, she'd kicked things up a notch. By doing a sexy striptease for e billionaire. Something she'd never done for him in the bedroom. Ever.

"Son of a bitch," William muttered.

Then, Xander and Buffy. In bed.

The billionaire and his wife. Kissing first. Then, his hungry mouth on her lovely breasts. His right hand between her legs. Moving.

William shut his eyes. And let out a shaky breath. But the images didn't stop.

He saw Xander settle between Buffy's legs. Then, slowly pull down her panties.

"Taste me, Xan," Buffy had said. Huskily. Hell, she'd almost begged him.

The billionaire had obliged. Much to his wife's pleasure.

Wearing Buffy's wedding ring, William thought. fucking wedding ring. On his pinky.

When William remembered the look on Buffy's face, he shuddered.

Then, Xander had raised his head. And, with the tase of Buffy's quim on his lips, invited William to join them. To watch what happened next.

"You're not going to wanna miss what happens next," the billionaire had said. His dark eyes gleaming with malice. "Trust me."

Buffy was looking at him too. His wife had said nothing. William hadn't dared lock eyes with her.

"What the fuck?" William whispered. Unable to understand. What had caused her – his Buffy, his sweet, loving wife – to act this way. Like a fucking whore.

Now, the thought occurred to William.

Had Xander fucked Buffy yet?

The prospect that the billionaire and his wife had already been intimate – at least once – left William needing yet another drink. He downed yet another glass of booze. How many had that been? Five? Six? Seven. By now, William had lost count.

William looked at the clock on the mantelpiece. He'd been out here for the past hour and a half.

Now, the gravity of what had happened tonight hit William. What was happening right now. In the bedroom. Without a shadow of a doubt.

Xander is fucking Buffy, William thought. Again.

The billionaire was inside his wife. His Buffy. The woman he loved. Above all things and all others. Right fucking now.

William shut his eyes. Suddenly, the images began appearing in William's mind's eye. Of them.

Xander Lavelle Harris III. Between Buffy's legs. Which were raised in the air and spread wide. She was still wearing her high heels. They were in the missionary position.

Thee billionaire was inside his wife. Pumping away. Nice and slowly. Taking his time.

"Ooooh," Buffy was moaning. In unholy ecstasy. Her hands running across the billionaire's shoulders and back. "Oh Xan. Oh baby."

When Xander increased the pace of his thrusts, Buffy moved her hands down to his ass. Which she cupped.

William's eyes opened. They were filled with water. A tear rolled down his cheek.

He was still painfully hard.. His cock was throbbing. Begging for relief.

Then, another thought struck him.

They can't still be going at it, he thought. No. They must have taken a break. To cool off.

Suddenly, his brain was spinning.

Maybe they just did it one time, he thought. Maybe that's all it was. A goodbye fling.

William wondered if that was the case. If Buffy was regretting her actions. Waiting for him to come inside. Put a stop to things. To rescue her. From Xander.

Or maybe... maybe they were still going at it.

Now, another image flashed before William's eyes.

Xander and Buffy sitting on the bed. Naked and intertwined. They were in the Lotus position. One of his wife's favourites.

All the bedroom lights were off. But the room was lit up by at least a dozen candles. Giving the entire room a soft, golden glow.

The billionaire was sitting cross-legged. His right hand was behind him. Stabilising himself. His left hand on Buffy's back. His wife was in the billionaire's lap. Her hands were at the back of Xander's head. Buffy was riding Xander. Their bodies were covered in a thin sheen of sweat. They were face to face. Nose to nose.

Xander now moved his mouth down. To kiss Buffy's breasts. His wife's eyes now squeezed shit tight. Her face was wearing the expression of the purest bliss.

"Oh Xander!" Buffy was moaning. "Ooooh baby."

"Yeah Buff," Xander rasped. His hand moving down to cup Buffy's bottom. "Ride my fucking cock."

William was on his feet.

I have to know, William thought. Suddenly. I need to know. What's happening between them. And why.

William found himself walking back to the bedroom on shaky legs. His breathing growing unsteadier.

The door was still ajar. Just how he'd left it. But inside, all was quiet.

William looked. His heart stopped. The large bedroom was empty. Buffy and Xander's clothes were on the floor. But were gone.

"What?" William whispered. "What the fuck?"