俺の実家に伝わる以下略 Context (R-18): they are having sex, the female is a loli who is pretending they are not having sex (hence the massage). The dialogue 「Does massage feel good?」 「Fu, e? Mas, sage……?」 「Right right.俺の実家に伝わる以下略」 In the middle of the speech, I penetrate her from the entrance to the mouth of the uterus in one go 「Hanyaaaaa!? That, too strong……!」 「Sorry sorry. But if I do that, your illness will be cured quickly」
俺の実家に伝わる以下略 It's handed down in my family or something like that. 以下略 means: The rest is omitted since the listener already knows.