A guy in glasses is biting into a pink marshmallow chick while somebody else is puckering their lips out wanting a bite.
A man eats his last marshmallow as his friend begs for a bite, but he doesn't give in.
The somebody else must not be his friend.
There is no implication that it is his last marshmallow. Also, we do not know that the other person is his friend.
It was never implied that it was his last marshmallow. Puckering their lips for a bite is not the same as begging. It never said that he gave in.