how did you approach pegging

It's a sensitive topic, because it involves anal play + some degree of gender roles and expectations (yes, even if you are playing it as your girl doing you). You need to consider your current relationship and how to ease into it. I'd recommend waiting for this until you're both comfortable with anal play.

There are a few good articles on the net, here are two: link link

I finally built up the courage to open up and tell my wife that i was bisexual and I loved being on the receiving end off some good anal penetration...i don't think i ever seen her that wet before!!!

I brought it up pretty soon after we were engaged and had just started talking about toys. It turned out good, because that point we knew each other well and didn't have any sort of trust or homophobic issues, which seems to be dominant problem people always run into. I also looked into ways of keeping myself clean back there to help ease her hygienic paranoia.

If you're not in a strong relationship, it's definitely a risky thing to bring up.