Failed Youth Days

 Youth Day usually only rejuvenates the body. However, for some people, it can also rejuvenate the mind.
The person is not only physically young, but also thinks he or she is 20 years old, with no memory of his or her life past that point. This can lead to funny situations, like here with Tom (45) and his mother-in-law, Sylvie (70).
Tom was at Sylvie's house repainting her window shutters when Youth Day occurred and had the above-mentioned side effect for both of them.
As a result, they both saw each other as potential lovers to screw. Thus, within minutes of Youth Day, Tom unknowingly fucked his mother-in-law.
And the worst part is that in 24 hours, when they get back to normal, they will both remember EVERYTHING.