After trying to beg my gentle but slow-witted sister-in-law to "let me drink breast milk"... (Kashiwagi Fumika EBWH-365)

During summer vacation, I helped take care of my busy older brother and sister-in-law's child. My brother's wife, Ms. Fumika, had returned to work after her maternity leave, but because she was worried about leaving the child with outsiders, she decided to have me help look after him. Ms. Fumika is very beautiful and gentle; to be honest, I really envy my brother. However, she's a bit oblivious, or rather, a little airheaded. Like right now. Even though I, her adopted brother, am in the same room, she completely ignores me and lifts her clothes to start breastfeeding. "My breast milk is so full lately~ It's so engorged~" She doesn't even notice my furtive glances at her chest. My desire reached its limit, and without realizing it, I blurted out: "Please, please let me drink your breast milk too!" Of course, things couldn't just stop at breastfeeding... From then on, I began my days of frantically drinking my sister-in-law Fumika's breast milk while simultaneously engaging in some serious sexual activity.