Grandpa's Second Life

 https://www.reddit.com/r/MalePossession/comments/1jwh8n8/your_grandpa_was_a_closeted_homo_so_when_he/

Your grandpa was a closeted homo, so when he passed his spirit would still tie to this world. Wanting to fulfill his desire, he possess you, his young grandson to do it. He would get comfortable in your body while you take a backseat. "Nice body kiddo. We can have fun like this.