It had been a long day. You and Will both worked for the FBI, helping Jack. Over the months working together, you had grown closer. Especially since you moved in with Will to help with his Sleepwalking.

You had both just gotten home from a long day on the field. You were both aching, and covered in blood, all thanks to a stupid confrontation with a Serial Killer, you later took down.

Since most of it was dried by now, and you were both tired, and needed help, you had decided to just shower together. It's what friends do, right? Which is what led to Will behind you, scrubbing some blood off your back.