I want to jump his bones but...

So my fiancé and I started having sex again after having a baby 9 weeks ago. I worried that I wouldn’t have a sex drive, but it’s been in overload lately. My only problem, I get so shy when it comes to flirting or sexting or teasing him. I just don’t know what to do. Anyone have any advice? His birthday is this Friday and I want to have a little fun with him, I just get so shy and self conscious, especially because of my postpartum body.