"I'm going to become Oniichan's waifu!" Upon our parents being posted overseas for work, My sister and I ended up living together alone. She just loves me and is all excited over our newly wed couple like lifestyle. Cooking in naked apron, cleaning your back in the bath and sleeping all together! But, a man can only resist his sexual desires for so long... "If you are going to be Mai Waifu, you'll need to service me 'here' too..." Teach your little sister about how to sustain a happy married life! [Edited from DLsite]