My first ever view of my Mom's tits happened unexpectedly and it would be engraved into my head forever...
It occurred during my early teens as a horny pubescent kid. I had just woken up in my bedroom and was laying on my side. Mom was about to make breakfast and she walked over to my side, her body facing me. Since she had just woken up too, she had her PJ's on - a very loose T-shirt over her bra-less top.
She stood by my side and suddenly bent over at her waist, whispering to me what I wanted for breakfast. OMG, I saw it all. She bent at a 90 degree angle, fully exposing her naked C-cup tits in front of my face. There they were - just dangling a mere foot away from me. Since she was so close to my ear, she didn't realize what I was looking at...directly at her swaying tits, down the gap, to her bare stomach, all the way down to her pants. I purposely didn't say anything as she remained bent over, giving me a fantastic showing. After about 10 seconds she suggested something and walked back to the kitchen.
Later that morning I jerked off hard to that image, and would revisit it many times thereafter