how do I say I don't like oral sex given to me

Destiny

so my fiance and I have almost been together for 2 years and we are ttc because we are getting married not to long from now. when we have sex he loves to go down on me and it's nice but it doesn't really do anything for me. It's not that he's bad at it I just don't enjoy it as much as other foreplay but I don't want to .ale him tho k it's because of him that I don't like it. any advice on what to do?