Ask if he wants to join in

"Hey Chris, I was wondering if you'd like to join in?" You say.

Chris glances at Amy and Liz, then back towards you. "Sure, I mean only if Amy is okay with it."

Amy gives Chris a questioning look. "Babe, you know you can fuck me whenever you want."

"Then it's settled." Chris replies, grinning from ear to ear.

You let Amy stop sucking your cock as Chris takes out his own throbbing member.

"Amy, let me fuck your pussy from behind," you say to her.

Without question, Amy gets on all fours and turns around, wiggling her round ass at you. Just as you're about to insert your penis into Amy, you remember that her boyfriend is still there.

"Amy, suck Chris' cock." You demand.

Then you plunge into her pussy, thrusting violently in and out. Chris lines up his own dick with Amy's lips and thrusts into her mouth, ruthlessly skull fucking her.

Things are getting intense with both of you roughly spit roasting Amy, when all of a sudden you feel a tongue flicking at your base.

You look below to see Liz on her back, licking her sisters pussy and your dick!

"Sorry, Jack," she moans, "I just couldn't help joining in."

Liz continues to work at her own pussy, pushing two fingers in while still licking at Amy's pussy.

Before long, you can hear a sharp grunt and you know Chris is close. A few thrusts later and Chris let’s go of his load, coating her mouth with cum.

The sight of cum oozing our the side of Amy’s mouth sends you over the edge and you pull out by accident and send your load across the room. Your seed was on the table, TV and even on the ceiling!

Chris raises both of his arms. “Nice shot bro,” he exclaims.

You double high-five him and fall back onto the couch, letting out a huge sigh.