I love the sight of hickies on my wifes' tits. I sometimes cover them with hickies myself and I make sure to put some where they can be easily seen.
One of my favorite sexual experiences dealing with wife marking happened the night my very best freind, a crude and dirty pervert, cuckolded me on a camping trip. His cock is smaller then mine but he fucks like an animal! He was pretty rough with her. Pinning her down by her wrists while he plowed his cock into her and burried his tounge in her mouth. He moved down to her chest and was licking and sucking her titties as he fucked her. She was moaning and squeeling under him. squirming all over the place and meeting his every thrust. He started alternating chewing on her nipples with his teeth and licking/sucking her breasts. Sucking hard enough to make those beautiful hickies I love so much. My wife was enjoying it so much she was begging him to do it harder.
By then he was quite literally biting her nipples. They were blood red and harder then I've every seen them. She would take a sharp breath of air with each bite and would hiss out yes in approval each time he 'd release. He was so excited by her responses that he was soon ready to explode inside her. When he finally went over the top he bit down hard into her tender flesh next to her nipple. Sinking his teeth into her soft tit flesh, nearly breaking the skin as he came hard inside her. My wife clutched his head with both hands and held him fast to her breast as she howeled out in extacy and exploded into her own orgasm.
After he rolled off of her I climbed on top of her and stuck my hard as steel cock into her slippery pussy and stared down at her completely hickie covered tits. as she seductively teased me about how much she liked to be fucked hard and marked up by my freind. I licked and sucked her tits as I fucked her hard myself. I didn't last very long!
The hickies faded in a couple of days, but the bite mark lasted for nearly a month. She would give me a dirty smile when it was obvious I was remenbering how she got it.