After their intercourse, everyone was breathing heavily, after a pause, Sarah said happily, "Woah, that was so good." after that Sarah grabbed her and dad's shared penis and started rubbing it, after a while Luke's dad joined her until they unleashed another load.
As this happened, Luke noticed that Sarah's body was starting to change into a more masculine one and her breasts were starting to shrink. With each release of the load, her body changed more and more.
Luke reacted quickly by grabbing Sarah's hand and saying, "SARAH!, DAD!, STOP!" after Luke's reaction, they both stopped, still breathing heavily.
"What's the matter, Luke ? I really enjoyed myself."
"Yes, son, what is it that you react like that ?"
Luke replied firmly to their questions: "Watch what you're doing, what happened to your body."
Luke's father and Sarah began examining their body, half of Sarah's body had turned male, making it look practically like Luke's father's body, except for the tiny bulges where Sarah's breasts had been.
"Looks like you're turning into me, Sarah," Dad Luke said in surprise.
"Looks like it... but is it that bad?" Sarah replied, causing surprise and shock to Luke and his dad.
"I know, I know it sounds weird, but I like it, masturbating with your dick Mr Rogger I really like it and I don't mind becoming you I even kinda like the change, about you, Luke I will always love you no matter what, so please let me finish my transformation."
After a moment of silence, Luke just nodded in acceptance.
"Thanks, babe, it means a lot to me." Sarah said to Luke and kissed him passionately on the lips, then said to his father, "Mr. Rogger would you do it, I can't control my hands anymore."
Luka's dad grabbed his still erect member and started rubbing it faster and faster until they started releasing cum again.
Sarah and Luke's father moaned as their bodies changed, leaving nothing feminine, after a while Sarah's head began to move closer to Luke's father.
Sarah looked at Luke one last time and moaned, "Luke, I love you."
Luke accepting watched as his girlfriend's head is absorbed by his father's head.
After a while, his father's cock released the last load of cum, leaving no trace of Sarah on his body.
Luke approached his dad and asked, "Is Sarah still out there somewhere?"
His father, breathing heavily after the longest experience of his life, then replied, "Yes Luke, I feel Sarah inside me, she really likes it, but most of all, she's proud of you, Luke, for letting her do what she wanted."
Luke in a slightly sad but accepting voice said, "That's good, I'm glad she's happy." After a moment of silence, his father said, "Okay, we should clean up here and go."