Good Son/ tell her that if she needs help she can just ask you
"I don´t need help!" the girl says. "I am old enough to do this by myself!"
You decide to just wait for your mother.
Over the next 30 to 40 minutes your mother shows of her body in a lot of different outfits. You are glad when you finally leave the store to go home in the afternoon. Not only because it was pretty boring waiting around while she was changing all the time. You got turned on by your mothers body. Especially her two piece bikini was erotic as fuck.
You have get rid of the tension. Your carry the newly bought clothes of your mom to her room. She thanks you and you quickly hurry to your room to jerk off. You realize you forgot your key in her room. Do you want to go back to your mothers room and get it or jerk off now and get the key later?