On the latest case Steve had, he met you. You were really hot to him and also pretty smart so you could help them a lot. They even took you with them on the mission, which seemed to be a little problem after though.
As the stressful mission now was over, he brought you back to your home and took care of your wounds since you couldn't do it alone. After all you didn't have much experience with all of this.
Both of you were in the bathroom, you sat on the edge of the bathtub while he was crouched down infront of you.
When he gently took your shirt off and saw all the wounds on your skin he began to feel guilty. Why did he take you with him?
His fingers carefully trailed over one of your wounds before he began to clean it carefully with a small towel, making sure to not cause any pain.