Humbert and Lolita are both sinking lower. Her morals, he explains, are dropping; he, on the other hand is weak.
The small allowance he has allowed her has created a monster. Her demands for money in exchange for sex are becoming oppressive to Humbert. Concerned that Lolita is accumulating running money, Humbert periodically breaks into her room to steal back her money. She catches on to him and begins hiding the money elsewhere.