Hōnyū ganbō: Nōsatsu paizuri ijime

Original title: 豊乳願望 悩殺パイズリ締め

Kozue is a woman with a small bust who has always longed for a fuller figure, while her roommate Rena is busty but prefers the convenience of a smaller chest. One day—perhaps because their prayers were answered—they find themselves swapping bodies.