Strap-on dildo

You're interrupted from your task by Gina returning, a bag in her hand. She shimmies her skirt off and then drops her skirt and bag on the floor. She reaches into her bag and pulls out an object, but it isn't till she starts to put it on that you realise it's a strapon dildo. Gina walks over to your wife.

"Do you want me to show you what it's like to be fucked?"

Your wife nods her head vigorously, and Gina picks her up and carries her to the loungeroom couch. You go to follow, but almost trip over your pants. When you finally extricate yourself you walk into the loungeroom to find your wife lying over the couch arm, with Gina standing behind her, guiding her cock into your wife's pussy. Gina says one word to you:

"Watch." As she says this she slides her cock into your wife's pussy. She lets out a loud guttural moan, and you watch as Gina fucks the daylights out of your wife. She makes noises you have never heard, and cums again and again on Gina's strapon. By your wife's third orgasm you've started stroking yourself off, staring at Gina's big ass bounce up and down. Gina finally withdraws her big cock and your wife slides onto the couch fully, in a daze. Gina walks over to you, her rubber cock swinging. "Looks like that turned you on. Did you like seeing your wife fucked, or were you imagining it was you? You want this cock up your ass?" You nod. Gina jerks ger head toward your wife. "Go get permission."