Just Next Door by Roxanne Riley

She thought they were just new neighbors, but it turned out they’d become so much more.

When Kristen arrives on her new neighbor’s doorstep with a plate of freshly baked cookies, the only thing on her mind is making a good first impression. She’s not expecting to land a job nannying for the hot single dad who just moved in!
Not that she’s looking. After all, she’s in a relationship. And her boyfriend, Joel, quickly hits it off with her new boss, too.
The friendship between the three grows fast, but the attraction grows even faster.
One night together is all it takes for all three of them to fall, hard.
But will this fall leave them shattered? Or can they piece everything together to form a new family of their own?

Just Next Door is a bisexual menage romance with high heat MM and MFM scenes (swords do cross in this one!). It has no cliffhangers and no cheating, but it does have a very happily ever after and lots of steam.