Big men, bears, dads, chubs and cubs with big nipples and great chest anatomy. No twinks. Not just the usual fat white men. Very often NSFW and completely gay, so scram if you can't take that or if you're under 18. If I've posted a picture you feel should be removed, contact me via the Ask link and I'll consider removing it.
If you want information about how to increase the size and sensitivity of your own nipples, visit the link below under "Pages" about nipple hardware and technique. You'll find links to the product I've been using for a few years now--Supple Nipps--that works wonders. I'm also happy to answer questions about how I got where I am with mine.
Happy to post submissions as long as they're relevant and of good quality (I don't guarantee I'll post your stuff, I have standards).
I do two other Tumblrs: the mostly safe-for-work one is called "Bear and City," and is found at http://zurrabear.tumblr.com/. My other NSFW blog is called "Extraordinary Gentlemen" and is devoted to mature and bearish men who self-suck. It's at extentsss.tumblr.com.