A man and his wife both ended up falling for a woman they met at the gym, and are now living happily together as a 'throuple'.
Engineering expeditor and CrossFit gym owner, Mary Barillas, met her business partner and entrepreneur husband Leo, at high school when she was just 13.
The pair later started dating and eventually got married when Mary turned 17 - at which point Leo was in the Marine Corps and was based in Iraq, Sri Lanka, Korea and North Carolina.
Mary, now 32, moved to California to be with Leo, 34, before they moved back to Washington in 2010, when Leo left the Marines so they could set up their CrossFit business and start a family - which now includes their children Carson, nine, and Paige, four.
Five years later, the couple met estimator Kimberlee Slagle through their gym, and the three soon became friends.
However, as their friendship began to blossom, they realised there was actually an underlying romance, and the three became a 'throuple' in September 2016.
Kimberlee, 29, also has two kids - 11-year-old Keagen and seven-year-old Kymper - from a previous relationship, and the three have been living under the same roof with their children since June 2017, also sharing their unique family life on Instagram under the handle @pnwtriad16.
Leo said: "We have not always been a triad.
"Kim was a friend and Mary and I are married. Kim was a member at a CrossFit gym we owned. The friendship we all had turned into attraction."
He continued: "A romantic relationship started in 2016. Sometime that year we fell in love, probably at different times, for different reasons. We decided the three of us just vibed really well.
"Polyamory means being open and honest with who we are. We love more than one person and embrace that even though it is beyond the social norm.
"Honestly, it is not very different from a traditional two-person relationship, we have a special relationship with each of our partners that we love and cherish and together we have a throuple.
"Instead of two adults having a family, we have three adults. We all live together with our four children.
"The family members that know of our relationship have been really accepting. It is not just family though, all of our friends are also very accepting.
"We have been very fortunate to have friends and family who love us for who we are and they pay no regard to how we choose to live our lives, as long as we live a happy one."
While the trio admit their relationship might be a little out of the ordinary - and that it's not without its problems - they maintain that being a throuple allows them to live their best life.
Leo continued: "Jealousy is a real thing, in any relationship, not just polyamory. We have found the best way to deal with jealousy is to communicate.
"Communication is key to dealing with any issues that arise. If we cannot discuss them, we cannot fix them.
"We chat a lot about the future but find that living in the moment one day at a time is what is best for our family and us. Things can change so swiftly. Living in the here and now is what makes life worth living.
"Great things like diamonds come in small packages. I don't mind being shorter than these two beautiful ladies. I think it makes others wonder what is so amazing about me.
"We haven't encountered any negative reactions to our face about our lifestyle. We have had some people completely shocked and they typically have a ton of questions. Curiosity is normal and completely expected.
"It's OK to follow your heart and be with who makes you happy even if it is considered unconventional.
"Live the kind of life you want to live and live it with the people you love. You only get one life; you should live your best life.
"Live this life honestly and open. Open communication is key to any successful relationship, no matter the type.
"Disregard any negative comments about this lifestyle, because it is perfectly OK to love many."