Wow, flashbacks. I remember the tingle you're talking about. That was back before Lexi fully came intot he picture. I can assume I know how you feel, since I remember how I felt back then. I was confused, I felt like it didn't make any sense, I was embarassed... I would only 'go femm' when I was home alone, and I would supress it any other time. Now though we're fully comfortable with how we are, thanks largely to this site. Hopefully you will become comfortable as well. My suggestion is this: Let yourselves (assuming that the 'us' in your pronoun field means you go by plurals, if not, then yourself). be femm in private if you feel awkward about it, and then maybe you'll grow more comfortable in time. Basically, try to let things flow as they would normally, and don't fight it. I understand that public can be different though.
BTW, we go by plurals, so I'm sorry if I assumed incorrectly.
"I am not this body. I am in this body, and this is part of my incarnation and I honor it but that isn't who I am." -Ram Dass