I do that a lot. I love singing and I've sang to all of my partners. One of my partners has also sang to me a few times, once he played guitar and sang to me on Skype, I thought that was super sweet.
Me: bi female in my 30's
Partners: Hank, Dahlia and Fay
Metamours: Eddie (Dahlia's long-term partner)
Living with Hank, Dahlia, Eddie and rory (my ex/friend)