It’s actually very easy to find. Almost all DH shops offer profile pages of their girls. This profile typically consists of a list of basic - included - services. And a second list of paid options. Here you find more vanilla stuff like dildos, masturbation show, or getting blindfolded, but often also CoF ( typically 5000 yen), swallowing (also 5000), and AF (10000). Not all shops offer this, but very many do. The rest, of course, is up to each girl. X next to the option means no; ○ means okey. The first two are rather commonly okey with the girls, AF less so. Sometimes CoF is only okey for longer sessions. Presumably because of the potential damage to the makeup. Probably for the same reason, my impression is that actually more girls are okey with swallowing, than with cum-on-face. But I’m personally not really into neither of them - just an observation.