Oral sex with a condom is the standard on virtually every profile. Anyone offering it without says so explicitly.
If you cannot find what you are looking for in Langenhagen itself, the rest of the state of Niedersachsen is quickly within reach. The nearest places with their own listings are Bothfeld (5 km), Nordstadt (7 km), Isernhagen Farster Bauerschaft (8 km), Hannover (9 km), Garbsen (11 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.