Thanks for the positive remarks.
Here's another picture. Sorry it's a bit blurry--part of my fetish is to have her gently rock up and down on my nose, as if she's using my nose as a buttplug. So with her moving and the somewhat bad lighting, some of the pictures aren't as crisp as I'd like.
I also have a thing for cotton panties. Many of my pictures have her wearing them. For me, the simple act of pulling her panties to the side to better sniff her butthole is really erotic, forbidden and wonderfully perverted. A few moments after I had pulled her panties to the side and buried my nose in her butthole, she'd look down at me and ask "am I dirty" or "do I need a bath"? Regardless if she was clean or not, I'd tell her it smelled incredible--I never wanted her to be self-conscious.
Then we'd spend 15 minutes or so playing "face-games," such as how far I can get my nose or tongue in her ass. And obviously smothering--how long I can go without breathing. She loved burying two or three grapes in her ass, then pushing them out of her ass and directly into my mouth. After they fell in my mouth, it was my job to get them back up her ass (using my tongue only) without breaking them. All of this was in a very playful and light-hearted manner, with both of us laughing a lot.
I must say, though, there were times when she'd push the second or third grape out of her butthole, and she'd fart directly on my face. "Oops! Everything ok?" she'd ask while giggling. She would quickly realize that I'm such an ass-pervert that I loved it. Then she'd immediately reach back, open her ass, and bury my nose to its base.
I hope this isn't too perverted for everyone. If not, I can share some other stories. I have lots of "face-games" and "wiping (toilet paper) games" to tell.