It all started innocently enough. Back when I was 18 and my little sister Sara was 13, we were watching cable TV. I can’t remember what it was we were watching, but there was a nude scene, and without me realizing it, I tented my sweatpants with an erection. I didn’t know about it until my sister said, “Eww, that’s gross!” I looked at her, and then followed her gaze to my crotch. I must’ve turned beet red because I felt my face get really hot. I’ve always had a problem with not being able to tell if I had an erection or not, unless I intentionally wanted one. I took the throw pillow and covered myself and once it went away, I got up and left. Embarrassingly enough as it used to be when I’d go to the swimming pool and have an erection (thank god it was while I was in the water, most of the time), but this was in front of my sister.