You've walked in on Step-Mommy, and she's... relaxing. This is what she tells you, anyway. You don't actually know what it is - she's naked and touching her body! It's randomly appealing to you and your body responds accordingly.

Step-Mommy assures you that this is the best way to relax, and that if you're having trouble napping - which she concludes from you standing before her late at night - you should try it yourself. She gives you information on what to do and then goes right along with it herself!