>>34810607The joke is that he's putting the blanket on, but an action like that, halfway through completion, if drawn too subtly, can be interpreted as either the action or it's reverse occurring. So anon is implying he's taking the blanket off her.
Dissecting jokes is like dissecting frogs, you'll learn a lot but the frog will always die in the process, and both actions should only take place when you're young enough to still be in a lower grade classroom. Don't try to explain or figure out shit your pea sized brainlette mind can't comprehend.