It's the former. This is one of the products borne of the increasingly absurd and illogical tsundere stereotypes as of late, unlike when the concept was still fresh in the past.
Not like it's bad, but tsunderes like this can put you off sometimes.
... Wai- Hey, don't just barge into my room like tha-!with big brother's sperm <3Your little sister's faceis getting all shtickyI already decided I wouldn't do such things with Aniki, sohaa <3haa <3Saying "Let me cum on your face" to your own sister is really sick, so could you hurry up and disappear?if you understand, then make a 180 and...