I was eleven at the time and still have the fondest memory of my aunt.
Mum had my brother late in life and as a working mother returned to work as soon as possible. She chose to breast feed little Dan but work was not making it easy and I think she didn't have enough milk. So Lin, mum's sister had recently given birth and as she was babysitting Dan and myself after school, also shared breast feeding during the day.
I came home from school, it was a cold afternoon, Lin was on the sofa, her huge left breast exposed over the top of a black dress. She had slipped her arms through the straps to release one but still covering the other breast. Dan was in her lap feeding.
Lin greeted me with a smile as she held out her right arm inviting a cuddle. I dropped my bag and cuddled up to her. As I did she put out her arm around me and the other half of the top slipped below her engorged nipple. I was having a hormonal overload. I rested my face in that mass of joy, stared at that nipple, as Lin made no move to cover it I pretended to dose with my lips almost touching that bud.
As moments slipped by I let my mouth slowly touch, then gradually engulfed that nipple, gently at first then as I increased it I could taste a sweet flow in my mouth. Not a word was said but I got comfort from Lin's tight arm holding me close.
My dick was a raging lump in my shorts and without realising it I had been rubbing it through my shorts and I was about to cum. My body went rigid as I sucked and spasmed all at the same time.
You could see this wet patch appearing on my shorts as my spasms slowed and the reality started to sink in, but silence was broken by my aunt simply saying 'I think you should go and clean up now.'
Up until then this was the biggest thing in my life. Loved it.