I recently started sleeping with a friend of mine on a strictly friends-with-benefits basis. After a few weeks the topic of sexual fantasies came up and we started talking about our experiences, things that we secretly wanted to try and our fetishes. He dared me to try and guess what his fetish was so I named as many as I could think of. He declined being "into" any of the ones I listed. He started to get rather uncomfortable and began saying how much he wanted to tell me what he liked but he was scared of what I would think. I didn't pressure him because I could tell how much of a strain and effort emotionally it was for him to be even considering telling me. He finally, and nervously, spilled the beans and explained that he was into Diapers (he wanted his partner to wear one etc). He said he had only ever told an ex about his desire and it hadn't ended well - much embarrassment etc. It has been on my mind ever since he told me and we even talked about trying it out.
We continued to sleep together but nothing out of the ordinary happened until the last time we saw each other and he asked if I wanted to wear one for him. I declined, saying I wasn't comfortable with the idea yet because he sprung it on me but over the last few days I had been thinking about fulfilling his fantasy more and more. So, I went and bought some adult Diapers from the chemist, we arranged to meet up and I surprised him by dressing up in a German beer wench costume with the Diaper on under it. He LOVED it. I stayed the night and we used more Diapers in the morning. About 5 min after we had finished he was suddenly saying how guilty he felt and how disgusting he was, how we should just forget it ever happened because it was "wrong" for him to like Diapers. I told him i didn't regret anything and that I had lots of fun, that the only person who thought he was disgusting was himself.
I just don't know how to go about making him see that it is OK to have fantasies and fetishes and that I am enjoying helping him fulfill them. I want to make him feel less guilty. I think he hates himself for wanting to do these things. How can I go about doing this!? HELP!