Am I allowed to have oral sex with my wife as foreplay not actually swallowing any fluid?

You can kiss around the vagina and caress it. For you to imbibe her vagina is Makrooh (Highly reprehensible) and could steady be Haraam due to the failure of polluted vaginal fluids regularise if these be negligible. All vaginal fluids emanating from the somebody are Najis bastardized (in terms of Hanafi fiqh). It is Haraam to fondle and ingestion specified fluids.