I've grown up as an only child, and my parents are very free about nudity, and enjoy being naked at home most of the time. So, I grew up accustomed to that too. As I've grown, I began to have erections which were difficult to hide, and my parents eventually sat down with me and had the talk about masturbation. So they're okay with masturbation, and even encourage me to do it constantly, even if they are at home.
My mom says she enjoys seeing me masturbate, but not because it makes her horny or anything, just because she feels glad that I'm doing such a healthy activity without harming others. She also gives me a lot of pointers and new techniques. She is 39, and as she was approaching 40, she began to feel somewhat depressed. Suddenly, she had the idea she needed a boob job. My dad and I said that if it would make her happier, then sure. So she got one. Her natural boobs were double C, which I found very nice.
Once she had the implants, she could not receive any sunlight for some months, so she couldn't stay naked like she wished. However, my mom continued to walk without pants or panties on around the house. When the time was finally over, she began walking around naked at home again. The day she did this, mom showed me her new boobs, which became double D!!! My jaw dropped. Then, she asked if I wanted to feel them, and I did, holding each one with each hand of mine, squeezing lightly. They were nice and firm.
We were both naked while doing this, and I began to get hard. My mom noticed, and said that it was okay, and I could jerk off if I wanted to. I couldn't help myself, so I did, every once in awhile holding those magnificent boobs.
My mom allowed me to fondle her boobs for a long while after, but as I began to have girlfriends, this ended. Although, this was really fun for a kid who had recently reached puberty.