I've been friends with Ian for a long time. His wife and I also get along, though we're not particularly close.

It was Ian's birthday a few weeks ago and I decided to make it really special for him. His wife is flat chested and I'm rather busty. In the past he's expressed to me that he's never experienced a woman with large breasts before. So when it came time for his birthday, I wore my cutest outfit and went over to his house. I gave him a titfuck and let him finish on my chest. He was so happy and said he thought he'd never had the chance to do something like that and thanked me profusely. It really meant nothing and was just fun between friends.

Anyways his wife found out about it and now she's pissed. How can I fix this?

Tldr; I gave my friend a sexual present and his wife is mad.