Your girlfriend fucking your best friend

You stare at the scene in front of you. Lucy and Josh, your best friend, are completely naked. Josh's cock is ploughing into Lucy's pussy, and both of them are moaning. They haven't noticed you yet.

"What's going on here?" you yell.

Lucy and Josh turn to you, and quickly move apart. Josh covers himself with the blanket, while Lucy holds a pillow up.

"It's not what it looks like!" Lucy squeaks.

"Not what it looks like?" you repeat, your voice dangerously low. "So, enlighten me."

Neither Lucy nor Josh have a reply. You shove your hands into your pockets angrily, and feel the cool metal of the ring. Suddenly, it pulses briefly, and begins to heat up, as if it's feeling your anger.