Aqros161 said:
How should post #3987163 be rated? howto:rate doesn't list anything about sex-related dialogue.
Guidelines for sex-related dialogue can be found in forum #213388, though it would be better for them to be listed in howto:rate. Basically, dialogue that can be understood by English speakers, including translated text, can affect the rating.
Regardless of the dialogue, the collar around the daughter's neck would make this at least S (BDSM is normally Q, but this is on the milder side). I'm not sure whether this combined with the dialogue is enough to elevate it to Q, but I'll keep it as is just in case and let someone else figure it out.