...one does not simply shove it inside an ass without adequate preparation.

Actually I don't think they went all the way.... So it's fine~~

look again - http://www.mangago.zone/read-manga/danshi_koukouseiteki_kazoku_keikaku/sa/sa-c005/32/

i think this manga is like a fairytale... if were real he would have died!!! But is cute... ٩(๑❛ᴗ❛๑)۶