Preston and I have been best friends and roommates since the first day of boarding school. If it weren’t for me, he’d never step away from his precious dissertation, not to eat, not to shower, not for anything. I might have been in love with him for ages, but Preston has never expressed any interest in anyone other than his research. That's fine, there are plenty of guys at Mars Fitness who can help me get my rocks off. Then one day, the sexiest man alive walks through the front door and sweeps me off my feet. He's everything I've ever wanted, except there's just one problem. He wants my heart, but how can I give it to him when I've already given it to Preston? Stacked is a best friends to lovers, gay-awakening, nerd/jock MM romance between co-dependent roommates. It is the second book in the Mars Fitness series and can be read as a standalone. Happily ever after guaranteed.