Potentially Messy Experience

I have been with my girlfriend for a long time but have always had a thing for her sister. She is five years older. Every now and then, I am alone at their house for different reasons, and I always take the chance to open her sister's underwear drawer and sift through it. I always find a pair I like and leave my impression on them. The other night, I got the chance to give her a hug, and I almost made a mess in my pants during that experience.

— Yuri, 20