A little humor in porn is only a plus.
This guy who is tied up, he appears in many videos, I think, as this simpleton who gets cheated on by his girlfriend. Just look at his face, it simultaneously expresses frustration, helplessness and cowardice. I wouldn't be surprised if, after the lover left and the girl untied him, she only had to say a few sweet-faced phrases for this cuckold to forgive her.
The stepmother took up the cause, deciding to accustom her stepdaughter to quick sex. The only way to work her vagina was with a strap-on. The masquerade was a success.