a yaoi manga, "someone got drunk and woke up with stranger in bed"...thanks XD
http://www.mangago.me/read-manga/hokenshitsu_de_suki_ni_shite/
if you want love after a one-night stand here`s a list:
http://www.mangago.me/home/mangalist/16834/?filter=&page=1
I was working as a cashier in a supermarket ,and I found out that my boss were siblings...against all odds,they managed to be together for years,and they had 3 children,but the children were all abnormal, strange'
well... that the consequences when siblings get together... the chance of abnormal child is very high...
It's not strange as anyone said having siblings do "it" together and bear children those children for sure will be abnormal if not physically .mentally