Pervert at the door!
He was planning to keep cumming inside Serena until she becomes pregnant and gives birth to his child some day.
...
After Rae was done with Serena, he dressed up and admired the scene of Serena, a beautiful milf whose Vagina gushed out his semen while she slept soundly.
"Alright! Come out already. You have seen enough!" Rae said as looked in the direction of the door.
There was no response to his words, the person who was spying on them from outside did not react.
"You... Are you worried about Serena? Don't worry! She's asleep already." Rae said to the person outside.
It was true that Serena was sleeping soundly and she would not be able to see and hear the person outside.
He thought that the individual did not want to reveal his identity to Serena and that's why the hesitation.