Oral sex with a condom is the standard on virtually every profile. Anyone offering it without says so explicitly.
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If you cannot find what you are looking for in Niederkassel itself, the rest of the state of Nordrhein-Westfalen is quickly within reach. The nearest places with their own listings are Wesseling (5 km), Bornheim (7 km), Troisdorf (8 km), Alfter (9 km), Brühl (9 km).
Oral sex with a condom is the standard on virtually every profile. Anyone offering it without says so explicitly. Nothing here for you? Have a look at the other services or widen your search area.