During summer vacation, I'm taking care of the kids at my brother's house since he and his wife are both busy working. My brother's wife, Fumika-san, returned to work after maternity leave, but since they were anxious about leaving the kids with strangers, I ended up looking after them.
Fumika-san is incredibly beautiful and kind; honestly, I'm jealous of my brother. She's just a bit airheaded, or rather, she has some scatterbrained moments.
Even right now. Despite me, her brother-in-law, being in the same room, she's lifting her clothes and breastfeeding without a care in the world.
"My breasts have been so full lately... they're practically bursting~"
She doesn't seem to notice my gaze stealing glances at her breasts at all.
My arousal reached its limit, and before I knew it, the words slipped out:
"P-please let me drink your breast milk too!"
Of course, it didn't end with just breastfeeding...
From that moment, the days of gulping down my sister-in-law Fumika-san's breast milk while fucking her relentlessly began.
