EAT ME OUT

guys I want my boyfriend to go down on me. He has only done it 3 times and we've been having sex for 2 and a half years. I always give him head and it's so embarrassing for me to ask him to go down on me. What do I do?? Like I clean my vagina and shave and use scented soap and everything. How do I get him to without actually saying it?? :(