Collision Course, by K.A. Mitchell, is free courtesy of Samhain (so check the content warning before one-clicking).
Book Description
Immovable object? Meet the irresistible force.
Paramedic Aaron Chase doesn't have anything against love. It just comes with a lot of responsibility, like when he had to raise his sister and brothers after their drug-addicted mom took off for good. Now that the last one is off to college, Aaron's anticipating enjoying life on his own terms. He certainly wasn't expecting Joey Miller to accidentally drop into his life.
Joey's sexy, funny and annoyingly optimistic, and his tendency to get into trouble keeps sending him Aaron's way. Even the fact that Joey works for the hated social work system isn't reason enough to keep him out of Aaron's bed.
Joey knows all about love. He's fallen in it ten times-he thinks. It's not that he can't tell the difference between sex and love. All that experience has to count for something, right? With Aaron it's different. Maybe because there's something to fight for.
This time Joey's fallen for good. He's not going to let number eleven get away.
Warning: This love story may overheat readers or the devices used to read it. Explicit m/m sex scenes involving extra penetration, toys, and spanking.