Massaging my friend

I have a friend who as of late I have had some experiences getting to touch and massage her feet. She is a very close friend of mine. She will come to my apartment and enjoy food that I cook for her and we will chat for hours on end. She is a lesbian and she has a girlfriend, but she has an amazing personality that I adore and I find her very, very attractive. It all started when we played a drinking game that dared me to massage her feet, and to my surprise she said yes, despite her declining to challenges like this before. We had done a long hike in the morning so she was sore. It was absolutely divine, she loved my massage. Since then, on other occasions, I have offered her and given her a foot massage. She will let me do it for as long as I like, and definitely enjoys it. I have made jokes about her feet smelling, just about every time we do it, and each time she responds by putting her foot in my face for me to sniff. Playing that game one time has broken the ice and removed all tension involved with me massaging her/offering to massage her. That being said, she knows nothing of my fetish, and there are no romantic prospects between us because she is very much a lesbian and is in a long term relationship. I enjoy massaging her feet and do not wish to take it any further, especially because she is a good friend of mine and I genuinely really enjoy being around her.

I guess this post is also a question but I can only add one flair. I am not an asshole for this, am I? I just politely offer, and she always says yes. I enjoy giving a massage not just because I like her feet, but I also do it because she genuinely enjoys it and I want to do that for her. We have a great relationship and this has not changed or impacted it in any way. That being said, if she knew I was attracted by feet, I don’t know if she would be as enthusiastic about it. Knowing her, I think there is still a decent chance she’d let me but I can’t be certain. If I had to pick between our friendship and giving her foot massages, I would pick our friendship every day. She is my best friend.