This is one of my favourite memories.

My wife and I had been playing around in bed, no penetrative sex, and eventually she was lying on the bed, facing the side of the bed where I was now standing to watch her. She had her legs spread and was playing with herself for me to see, while I rubbed my cock in front of her. We love mutual masturbation in general, and she gets really turned on seeing me stroking myself to her.

As I reached orgasm, I was so turned on from watching her that I naturally shot out the first 5-6 huge spurts of cum powerfully from where I was standing, directly onto her waiting pussy. Exciting factor #1: cumming while watching her eyes fixated on my cock, seeing her mouth fall open, and hearing her audibly gasp with lust.

Because her hand was also in the way, furiously working her clit, a lot of my cum splashed hard onto the back of her hand and all over her fingers. Exciting factor #2: seeing her get overwhelmed with how turned on this made her. Without stopping, she frantically continued rubbing her clit but deliberately getting the sticky mess all over her pussy. It tipped her right over the edge, and she bucked wildly and came extremely hard using my cum to get herself off.