AriellaEdna

i want to know the title of manga.. it's not a yaoi.. but the cover page confuse me before.. it look like yaoi while the girl just have short hair and flat chest.. the man was suppose marry the sister of the girl.. but the sister run away.. so eventhough the girl still in high school she was force to marry the man.. she study at girl school.. so get confess a lot from the girl there... she doesn't know how to cook but the man know... at first she been compare between her sister about their body and all.. but they have happy ending.. they have sex too