Yakeppachi's Maria is a sex education manga created in 1970 by Osamu Tezuka. It chronicles the adventures of Yakkepachi, son of Shunsaku Ban, and Maria, a blow-up doll posessed by a spirit he "gave birth" to.
B.G. Club (Volume 1, Chapter 5)
Yakkepachi saves Maria from drowning, as she cannot swim, and when she is pulled out she is filled heavily with sea water.
Bloated Ghost (Volume 1, Chapter 6)
The ghost of Butano Hana, a plump girl who 60 years ago fell to her death while having fun, takes control of Maria's body, making her look very fat, just to visit her ex-boyfriend Kacchan again.