On a whim, Summer sends a racy text to her ex Aiden hoping for a booty call. He's happy to indulge (and re-kindle something) and they have a hot sexy night together. He tells her he has a proposition for her, but he puts off telling her until the morning.
Over breakfast he tells her about his partners Ryker (his bestfriend that Summer knows) and Marcello and tells her their collective failures at keeping a girlfriend given that their work takes them away for days/weeks at a time and eventually the girls get tired of being second. His proposal is that she be a shared girlfriend amongst them, a win for everybody. The guys get the girl of their dreams w/o the worry of keeping her happy being away all the time, and she gets the benefit of three men to satisfy her. She'd never be alone, essentially one of the guys would always be home while the other two were off working w/clients. Aiden asks her why they broke up, and she honestly tells him because he no longer had time for her, and he confirmed the truth in that. There's still a flame burning for these two, and he wants her back.
Since she and Aiden had a very active sex life before, and a deep connection, she's considering the possibility. They talked about bringing others into the bedroom with them, including Ryker, and both had pushed each other to the next level in/out of the bedroom.
The guys are flying out to Tahiti in a few days and Aiden wants her to come with them, meet Marcello, see what happens. She agrees, much to her surprise and excitement.
Ryker is absolutely excited that Summer said yes--and on the plane tells her he's wanted her from the day he set eyes on her, but because his best friend had her, he did nothing, and even when they broke up, he stayed away because that's how much Aiden meant to him. You don't date your bff's ex girlfriend, ya just don't.
They get to Tahiti and Summer gets right down to it--let the debauchery ensue! They have a wild night and everyone is more than satisfied. They layout some ground rules--basically anything goes at anytime with anybody. She goes on a one-on-one dates with Ryker and Marcello and cements connections with both, especially Ryker. He just flat out tells her he's been in love with her and has wanted to be with her and she admits she's had feelings for him from the beginning as well, but was with Aiden...
The four are out to dinner and when they return they find their room was broken into and Ryker's work computer was taken. It wouldn't be that big a deal, if it didn't contain everything for their business. It was his bright idea to keep everything on one computer vs on all three...the other's have some info, but would never be able to get everything that was on Ryker's. And they know who stole it. Corey. Former partner. He's been trying to steel business/clients from the guy's since they parted ways.
So Summer Ryker and Marcello go after the laptop that pinged in Sydney while Aiden stays and finishes with the client.
The find out the computer is at a hotel, so they book a room there and then take turns steaking out the lobby looking for Corey. As dumb luck would have it, Summer in in the hotel bar and he comes over to hit on her. Realizing who he is, she lets him pick her up and they go back to his room. She sees the laptop and is able to take it and run back to their room where Ryker checks to see if all the info is still intact. Except its not his laptop--its Corey's.
When Aiden joins them in Sydney they set up an exchange with Corey to give each other's laptops back. Corey is just a spiteful angry man, and after the exchange and Corey leaves, Ryker realizes their files have been copied and they all run after him to stop him.
Summer ends up getting the guy helping Corey, and Aiden roughs him up and fortunately gets the zip drive off him and sends him on his way. Ryker confirms that the info was only copied the once and everyone breaths a collective sigh of release. And then proceed to have a night of lovemaking.
Aiden and Summer recommit saying I love you and agreeing they never should have broken up. Summer and Ryker say I love you as well--and Summer realizes she loves all three of the guys and has never felt so sure about anything in her life.
Summer and Ryker head home--she to get her business set up so she can work on the road with the guys, and Ryker to check in on his brothers and their family business. Aiden and Marcello are both working on two locations/clients. While they're home, Summer and Ryker make up for all the things they should have been doing when she was dating Aiden.
The four come back together to start their lives together....
In an extra epilogue three years later, Summer is pregnant, and they've bought a building to house both businesses that are growing nicely. They also bought property to build their dream home.
Happily ever after for everyone!