Plot: pop is fine with any sex position, as long as the position he's in is the same one he was in with Ma (His wife) when he produced the sperm that made Cub. Too bad he doesn't remember it.

Pop was just about to put Cub in the playroom when he heard a knock on his door. He hurried up and answered the door to find Sweetheart, just standing there. Once the two were done chatting, they went upstairs to Pop's room. Sweetheart started undressing and Pop was getting flashbacks of when Ma was seducing him. Her boobs jiggling as her bra was loosened, presenting her juicy ass as she removed her panties. Doing her best to give Pop an erection.
Sweetheart then manually removed Pop's robe so they can make love. Sweetheart kept taunting Pop with her sweet ass, ready any time. Once Pop got started, there was no stopping him. His cock thrusting in and out of Sweetheart's vagina. Each and every waking moment a pleasureful experience.
To make the moment as memorable as possible, Pop wanted to cum in Sweetheart the same way he came in Ma. He tried concentrating, but he just couldn't remember what position they were in. Time was limited, so he had to think fast. It couldn't be 69, Pisces, Jackhammer, or anything where the cock wasn't in the vagina.
With little time to act, Pop pulled his dick out of Sweetheart before it was too late. The position they were in was based on something about Ma. Was it her birth month? Her favorite animal? Pop was strict on which position to end in, but pulled through the thinking. Pop decided to go through his VHS tapes and see which one was him fucking Ma.
With a bit of patience, Pop finally found it. Watching the tape he now remembered he came in the Lotus Flower position. After all, There were a bunch in their backyard pond. It was so obvious! As Sweetheart and Pop got in the position, Pop gave one final thrust which he had been aching to do for over 30 minutes. Pop now had the memory of cumming into Ma in that position.
He was now happier than ever to relive the feeling of being with Ma. Sweetheart was glad he remembered, and hissed him goodbye.