This actually kind of happens when he tells nezuko to "cauterize" his arm after he gets it cut off, and she takes it seriously and uses her blood demon art to do it and he is basically on fire for a sec, so it is canon.
Tengen and his 3 wives are late to the funeral: Tanjiro:*checks on them* Tanjiro:*walks in* Tonjiro: ( I witnessed somthing i shouldn't have) Edit: I almost deleted my comment bc I was checking all my replies 😂 At Ty for 1.3k likes most I’ve ever had