Series: All-you-can-breed little ones (yuppai)

Original title: おちびちゃん産み放題

https://www.pixiv.net/en/artworks/89763833

"おにーさん！おちびちゃんはゆっくりできるんだよ！だかられいむはおちびちゃんがほしいよ！"
"Mister! Little ones can take it easy! So Reimu wants little ones!"

Explanation says it all. A gold badge reimu disobeys her owner and refreshes with a stray marisa, her owner find a very unique way to punish her for her betrayal.